diff --git a/.github/workflows/CompatHelper.yml b/.github/workflows/CompatHelper.yml
new file mode 100644
index 0000000..0918161
--- /dev/null
+++ b/.github/workflows/CompatHelper.yml
@@ -0,0 +1,45 @@
+name: CompatHelper
+on:
+  schedule:
+    - cron: 0 0 * * *
+  workflow_dispatch:
+permissions:
+  contents: write
+  pull-requests: write
+jobs:
+  CompatHelper:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check if Julia is already available in the PATH
+        id: julia_in_path
+        run: which julia
+        continue-on-error: true
+      - name: Install Julia, but only if it is not already available in the PATH
+        uses: julia-actions/setup-julia@v1
+        with:
+          version: '1'
+          arch: ${{ runner.arch }}
+        if: steps.julia_in_path.outcome != 'success'
+      - name: "Add the General registry via Git"
+        run: |
+          import Pkg
+          ENV["JULIA_PKG_SERVER"] = ""
+          Pkg.Registry.add("General")
+        shell: julia --color=yes {0}
+      - name: "Install CompatHelper"
+        run: |
+          import Pkg
+          name = "CompatHelper"
+          uuid = "aa819f21-2bde-4658-8897-bab36330d9b7"
+          version = "3"
+          Pkg.add(; name, uuid, version)
+        shell: julia --color=yes {0}
+      - name: "Run CompatHelper"
+        run: |
+          import CompatHelper
+          CompatHelper.main()
+        shell: julia --color=yes {0}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}
+          # COMPATHELPER_PRIV: ${{ secrets.COMPATHELPER_PRIV }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5dae0f4..123bca0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Changelog
 
+## [v1.5.0] - 2023-10-12 09:24:07
+
+### Added
+
+- `add_alpha`
+
+### Changed
+
+- fixed indexed list handling (#10)
+- minimum Julia version now 1.6
+
+### Removed
+
+### Deprecated
+
 ## [v1.4.0] - 2022-12-21
 
 ### Added
diff --git a/Project.toml b/Project.toml
index f4288a6..654cafc 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "ColorSchemeTools"
 uuid = "d3e213a1-5e82-5c18-bb32-2a58a99f8c46"
 authors = ["cormullion <cormullion@mac.com>"]
-version = "1.4.0"
+version = "1.5.0"
 
 [deps]
 Clustering = "aaaa29a8-35af-508c-8bc3-b662a17a0fe5"
@@ -14,14 +14,14 @@ Interpolations = "a98d9a8b-a2ab-59e6-89dd-64a1c18fca59"
 QuartzImageIO = "dca85d43-d64c-5e67-8c65-017450d5d020"
 
 [compat]
-Clustering = "0.13, 0.14"
-ColorSchemes = "^3"
+Clustering = "0.15"
+ColorSchemes = "3"
 Colors = "0.9, 0.10, 0.11, 0.12, 0.13"
-FileIO = "^1"
-ImageMagick = "0.7, 1, 1.1, 1.2"
-Images = "0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25"
+FileIO = "1"
+ImageMagick = "1.3"
+Images = "0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26"
 Interpolations = "0.12, 0.13, 0.14"
-QuartzImageIO = "^0.7"
+QuartzImageIO = "0.7"
 julia = "1.6"
 
 [extras]
diff --git a/README.md b/README.md
index 3d97d3c..073588a 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,13 @@
 
 ## ColorSchemeTools
 
-This package provides tools for working with colorschemes and colormaps. It's a companion to the ColorSchemes.jl package.
+This package provides tools for working with colorschemes and colormaps. It's a
+companion to the
+[ColorSchemes.jl](https://github.com/JuliaGraphics/ColorSchemes.jl) package.
 
-For example, you can extract colorschemes from images, and replace an image colorscheme with another. There are also functions for creating color schemes from lists, dictionaries, and functions.
+For example, you can extract colorschemes from images, and replace an image
+colorscheme with another. There are also functions for creating new color schemes
+from lists, dictionaries, and functions.
 
 This package relies on:
 
diff --git a/docs/Manifest.toml b/docs/Manifest.toml
new file mode 100644
index 0000000..31ca51b
--- /dev/null
+++ b/docs/Manifest.toml
@@ -0,0 +1,1440 @@
+# This file is machine-generated - editing it directly is not advised
+
+julia_version = "1.10.0-beta3"
+manifest_format = "2.0"
+project_hash = "72f00dde3794986e88e6b3b786372e95296a486c"
+
+[[deps.ANSIColoredPrinters]]
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+uuid = "a4c015fc-c6ff-483c-b24f-f7ea428134e9"
+version = "0.0.1"
+
+[[deps.AbstractFFTs]]
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+weakdeps = ["ChainRulesCore", "Test"]
+
+    [deps.AbstractFFTs.extensions]
+    AbstractFFTsChainRulesCoreExt = "ChainRulesCore"
+    AbstractFFTsTestExt = "Test"
+
+[[deps.AbstractTrees]]
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+uuid = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"
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+
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+    AdaptStaticArraysExt = "StaticArrays"
+
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+
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+
+    [deps.ArrayInterface.extensions]
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+    ArrayInterfaceBlockBandedMatricesExt = "BlockBandedMatrices"
+    ArrayInterfaceCUDAExt = "CUDA"
+    ArrayInterfaceGPUArraysCoreExt = "GPUArraysCore"
+    ArrayInterfaceStaticArraysCoreExt = "StaticArraysCore"
+    ArrayInterfaceTrackerExt = "Tracker"
+
+    [deps.ArrayInterface.weakdeps]
+    BandedMatrices = "aae01518-5342-5314-be14-df237901396f"
+    BlockBandedMatrices = "ffab5731-97b5-5995-9138-79e8c1846df0"
+    CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
+    GPUArraysCore = "46192b85-c4d5-4398-a991-12ede77f4527"
+    StaticArraysCore = "1e83bf80-4336-4d27-bf5d-d5a4f845583c"
+    Tracker = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
+
+[[deps.ArrayInterfaceCore]]
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+
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+[[deps.ColorSchemeTools]]
+deps = ["Clustering", "ColorSchemes", "Colors", "FileIO", "ImageMagick", "Images", "Interpolations", "QuartzImageIO"]
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+
+[[deps.SpecialFunctions]]
+deps = ["IrrationalConstants", "LogExpFunctions", "OpenLibm_jll", "OpenSpecFun_jll"]
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+weakdeps = ["ChainRulesCore"]
+
+    [deps.SpecialFunctions.extensions]
+    SpecialFunctionsChainRulesCoreExt = "ChainRulesCore"
+
+[[deps.StackViews]]
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+
+[[deps.StaticArrayInterface]]
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+uuid = "0d7ed370-da01-4f52-bd93-41d350b8b718"
+version = "1.4.1"
+weakdeps = ["OffsetArrays", "StaticArrays"]
+
+    [deps.StaticArrayInterface.extensions]
+    StaticArrayInterfaceOffsetArraysExt = "OffsetArrays"
+    StaticArrayInterfaceStaticArraysExt = "StaticArrays"
+
+[[deps.StaticArrays]]
+deps = ["LinearAlgebra", "Random", "StaticArraysCore"]
+git-tree-sha1 = "0adf069a2a490c47273727e029371b31d44b72b2"
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+version = "1.6.5"
+weakdeps = ["Statistics"]
+
+    [deps.StaticArrays.extensions]
+    StaticArraysStatisticsExt = "Statistics"
+
+[[deps.StaticArraysCore]]
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+
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+
+[[deps.StatsBase]]
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+version = "0.34.2"
+
+[[deps.SuiteSparse]]
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+
+[[deps.SuiteSparse_jll]]
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+uuid = "bea87d4a-7f5b-5778-9afe-8cc45184846c"
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+
+[[deps.TOML]]
+deps = ["Dates"]
+uuid = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
+version = "1.0.3"
+
+[[deps.Tar]]
+deps = ["ArgTools", "SHA"]
+uuid = "a4e569a6-e804-4fa4-b0f3-eef7a1d5b13e"
+version = "1.10.0"
+
+[[deps.TensorCore]]
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+
+[[deps.Test]]
+deps = ["InteractiveUtils", "Logging", "Random", "Serialization"]
+uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[[deps.ThreadingUtilities]]
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+
+[[deps.TiffImages]]
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+git-tree-sha1 = "34cc045dd0aaa59b8bbe86c644679bc57f1d5bd0"
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+
+[[deps.TiledIteration]]
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+
+[[deps.TranscodingStreams]]
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+git-tree-sha1 = "9a6ae7ed916312b41236fcef7e0af564ef934769"
+uuid = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
+version = "0.9.13"
+
+[[deps.UUIDs]]
+deps = ["Random", "SHA"]
+uuid = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
+
+[[deps.UnPack]]
+git-tree-sha1 = "387c1f73762231e86e0c9c5443ce3b4a0a9a0c2b"
+uuid = "3a884ed6-31ef-47d7-9d2a-63182c4928ed"
+version = "1.0.2"
+
+[[deps.Unicode]]
+uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
+
+[[deps.VectorizationBase]]
+deps = ["ArrayInterface", "CPUSummary", "HostCPUFeatures", "IfElse", "LayoutPointers", "Libdl", "LinearAlgebra", "SIMDTypes", "Static", "StaticArrayInterface"]
+git-tree-sha1 = "b182207d4af54ac64cbc71797765068fdeff475d"
+uuid = "3d5dd08c-fd9d-11e8-17fa-ed2836048c2f"
+version = "0.21.64"
+
+[[deps.WoodburyMatrices]]
+deps = ["LinearAlgebra", "SparseArrays"]
+git-tree-sha1 = "de67fa59e33ad156a590055375a30b23c40299d3"
+uuid = "efce3f68-66dc-5838-9240-27a6d6f5f9b6"
+version = "0.5.5"
+
+[[deps.XML2_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Libiconv_jll", "Zlib_jll"]
+git-tree-sha1 = "24b81b59bd35b3c42ab84fa589086e19be919916"
+uuid = "02c8fc9c-b97f-50b9-bbe4-9be30ff0a78a"
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+
+[[deps.XSLT_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Libgcrypt_jll", "Libgpg_error_jll", "Libiconv_jll", "Pkg", "XML2_jll", "Zlib_jll"]
+git-tree-sha1 = "91844873c4085240b95e795f692c4cec4d805f8a"
+uuid = "aed1982a-8fda-507f-9586-7b0439959a61"
+version = "1.1.34+0"
+
+[[deps.Xorg_libX11_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Xorg_libxcb_jll", "Xorg_xtrans_jll"]
+git-tree-sha1 = "afead5aba5aa507ad5a3bf01f58f82c8d1403495"
+uuid = "4f6342f7-b3d2-589e-9d20-edeb45f2b2bc"
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+
+[[deps.Xorg_libXau_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl"]
+git-tree-sha1 = "6035850dcc70518ca32f012e46015b9beeda49d8"
+uuid = "0c0b7dd1-d40b-584c-a123-a41640f87eec"
+version = "1.0.11+0"
+
+[[deps.Xorg_libXdmcp_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl"]
+git-tree-sha1 = "34d526d318358a859d7de23da945578e8e8727b7"
+uuid = "a3789734-cfe1-5b06-b2d0-1dd0d9d62d05"
+version = "1.1.4+0"
+
+[[deps.Xorg_libXext_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg", "Xorg_libX11_jll"]
+git-tree-sha1 = "b7c0aa8c376b31e4852b360222848637f481f8c3"
+uuid = "1082639a-0dae-5f34-9b06-72781eeb8cb3"
+version = "1.3.4+4"
+
+[[deps.Xorg_libXrender_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg", "Xorg_libX11_jll"]
+git-tree-sha1 = "19560f30fd49f4d4efbe7002a1037f8c43d43b96"
+uuid = "ea2f1a96-1ddc-540d-b46f-429655e07cfa"
+version = "0.9.10+4"
+
+[[deps.Xorg_libpthread_stubs_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl"]
+git-tree-sha1 = "8fdda4c692503d44d04a0603d9ac0982054635f9"
+uuid = "14d82f49-176c-5ed1-bb49-ad3f5cbd8c74"
+version = "0.1.1+0"
+
+[[deps.Xorg_libxcb_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "XSLT_jll", "Xorg_libXau_jll", "Xorg_libXdmcp_jll", "Xorg_libpthread_stubs_jll"]
+git-tree-sha1 = "b4bfde5d5b652e22b9c790ad00af08b6d042b97d"
+uuid = "c7cfdc94-dc32-55de-ac96-5a1b8d977c5b"
+version = "1.15.0+0"
+
+[[deps.Xorg_xtrans_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl"]
+git-tree-sha1 = "e92a1a012a10506618f10b7047e478403a046c77"
+uuid = "c5fb5394-a638-5e4d-96e5-b29de1b5cf10"
+version = "1.5.0+0"
+
+[[deps.Zlib_jll]]
+deps = ["Libdl"]
+uuid = "83775a58-1f1d-513f-b197-d71354ab007a"
+version = "1.2.13+1"
+
+[[deps.Zstd_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl"]
+git-tree-sha1 = "49ce682769cd5de6c72dcf1b94ed7790cd08974c"
+uuid = "3161d3a3-bdf6-5164-811a-617609db77b4"
+version = "1.5.5+0"
+
+[[deps.gdk_pixbuf_jll]]
+deps = ["Artifacts", "Glib_jll", "JLLWrappers", "JpegTurbo_jll", "Libdl", "Libtiff_jll", "Pkg", "Xorg_libX11_jll", "libpng_jll"]
+git-tree-sha1 = "e9190f9fb03f9c3b15b9fb0c380b0d57a3c8ea39"
+uuid = "da03df04-f53b-5353-a52f-6a8b0620ced0"
+version = "2.42.8+0"
+
+[[deps.libaom_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg"]
+git-tree-sha1 = "3a2ea60308f0996d26f1e5354e10c24e9ef905d4"
+uuid = "a4ae2306-e953-59d6-aa16-d00cac43593b"
+version = "3.4.0+0"
+
+[[deps.libass_jll]]
+deps = ["Artifacts", "Bzip2_jll", "FreeType2_jll", "FriBidi_jll", "HarfBuzz_jll", "JLLWrappers", "Libdl", "Pkg", "Zlib_jll"]
+git-tree-sha1 = "5982a94fcba20f02f42ace44b9894ee2b140fe47"
+uuid = "0ac62f75-1d6f-5e53-bd7c-93b484bb37c0"
+version = "0.15.1+0"
+
+[[deps.libblastrampoline_jll]]
+deps = ["Artifacts", "Libdl"]
+uuid = "8e850b90-86db-534c-a0d3-1478176c7d93"
+version = "5.8.0+1"
+
+[[deps.libfdk_aac_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg"]
+git-tree-sha1 = "daacc84a041563f965be61859a36e17c4e4fcd55"
+uuid = "f638f0a6-7fb0-5443-88ba-1cc74229b280"
+version = "2.0.2+0"
+
+[[deps.libpng_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg", "Zlib_jll"]
+git-tree-sha1 = "94d180a6d2b5e55e447e2d27a29ed04fe79eb30c"
+uuid = "b53b4c65-9356-5827-b1ea-8c7a1a84506f"
+version = "1.6.38+0"
+
+[[deps.libsixel_jll]]
+deps = ["Artifacts", "JLLWrappers", "JpegTurbo_jll", "Libdl", "Pkg", "libpng_jll"]
+git-tree-sha1 = "d4f63314c8aa1e48cd22aa0c17ed76cd1ae48c3c"
+uuid = "075b6546-f08a-558a-be8f-8157d0f608a5"
+version = "1.10.3+0"
+
+[[deps.libvorbis_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Ogg_jll", "Pkg"]
+git-tree-sha1 = "b910cb81ef3fe6e78bf6acee440bda86fd6ae00c"
+uuid = "f27f6e37-5d2b-51aa-960f-b287f2bc3b7a"
+version = "1.3.7+1"
+
+[[deps.nghttp2_jll]]
+deps = ["Artifacts", "Libdl"]
+uuid = "8e850ede-7688-5339-a07c-302acd2aaf8d"
+version = "1.52.0+1"
+
+[[deps.p7zip_jll]]
+deps = ["Artifacts", "Libdl"]
+uuid = "3f19e933-33d8-53b3-aaab-bd5110c3b7a0"
+version = "17.4.0+2"
+
+[[deps.x264_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg"]
+git-tree-sha1 = "4fea590b89e6ec504593146bf8b988b2c00922b2"
+uuid = "1270edf5-f2f9-52d2-97e9-ab00b5d0237a"
+version = "2021.5.5+0"
+
+[[deps.x265_jll]]
+deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg"]
+git-tree-sha1 = "ee567a171cce03570d77ad3a43e90218e38937a9"
+uuid = "dfaa095f-4041-5dcd-9319-2fabd8486b76"
+version = "3.5.0+0"
diff --git a/docs/Project.toml b/docs/Project.toml
index eb13c4f..4b8b1de 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -4,3 +4,6 @@ ColorSchemeTools = "d3e213a1-5e82-5c18-bb32-2a58a99f8c46"
 Colors = "5ae59095-9a9b-59fe-a467-6f913c188581"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 Luxor = "ae8d54c2-7ccd-5906-9d76-62fc9837b5bc"
+
+[compat]
+Documenter = "1"
diff --git a/docs/make.jl b/docs/make.jl
index 2d83d16..72e773b 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -3,10 +3,14 @@ using Documenter, ColorSchemes, ColorSchemeTools, Luxor, Colors
 makedocs(
     modules = [ColorSchemeTools],
     sitename = "ColorSchemeTools",
+    warnonly = true,
     format = Documenter.HTML(
+        size_threshold=nothing,
         prettyurls = get(ENV, "CI", nothing) == "true",
-        assets = ["assets/colorschemetools-docs.css"]),
-    pages    = Any[
+        assets = ["assets/colorschemetools-docs.css"],
+        collapselevel=1,
+    ),
+    pages = [
     "Introduction"             => "index.md",
     "Tools"                    => "tools.md",
     "Converting image colors"  => "convertingimages.md",
@@ -19,5 +23,6 @@ makedocs(
 deploydocs(
     push_preview = true,
     repo = "github.com/JuliaGraphics/ColorSchemeTools.jl.git",
-    target = "build"
-    )
+    target = "build",
+    forcepush=true,
+)
diff --git a/docs/src/assets/colorschemetools-docs.css b/docs/src/assets/colorschemetools-docs.css
index c37c06e..e4b2628 100644
--- a/docs/src/assets/colorschemetools-docs.css
+++ b/docs/src/assets/colorschemetools-docs.css
@@ -1,34 +1,128 @@
-p > a:after {
-    content: "→";
-    font-size: 50%;
+/* change Bulma Dark styles  */
+
+/* disclaimer - I hate CSS */
+
+:root {
+	--signage: hsl(193, 46%, 60%);
+	--verydark: hsl(237, 20%, 10%);
+	--quitedark: hsl(237, 20%, 13%);
+	--lessdark: hsl(237, 20%, 16%);
 }
 
-.schemename {
-    font-family: "JuliaMono";
+html.theme--documenter-dark body {
+	background-color: var(--verydark);
+	color: #eff;
+	font-size: 1.1em;
+	font-weight: 400;
+	line-height: 1.8rem;
+}
+
+html.theme--documenter-dark a {
+	color: var(--signage);
 }
 
-.swatch {
+html.theme--documenter-dark p>a:after {
+	padding-left: 0.2rem;
+	font-family: "JuliaMono";
+	content: "⮻";
+	color: var(--signage);
+	background-color: inherit;
+	font-size: 120%;
+}
 
+html.theme--documenter-light p>a:after {
+	padding-left: 0.2rem;
+	font-family: "JuliaMono";
+	content: "⮻";
+	background-color: inherit;
+	font-size: 120%;
 }
 
+html.theme--documenter-dark .has-text-left,
+html.theme--documenter-dark body,
+html.theme--documenter-dark #documenter .docs-sidebar,
+html.theme--documenter-dark .documenter-example-output,
+html.theme--documenter-dark #documenter .docs-sidebar ul.docs-menu .tocitem,
+html.theme--documenter-dark #documenter .docs-sidebar ul.docs-menu .tocitem:hover,
+html.theme--documenter-dark #documenter .docs-sidebar ul.docs-menu li.is-active .tocitem,
+html.theme--documenter-dark #documenter .docs-sidebar ul.docs-menu li.is-active .tocitem:hover,
+html.theme--documenter-dark #documenter .docs-main header.docs-navbar {
+	background-color: var(--verydark);
+	border: 0.5px solid hsla(237, 20%, 10%, 0.3) !important;
+}
+
+html.theme--documenter-dark .modal-card-body,
+html.theme--documenter-dark .modal-card-head,
+html.theme--documenter-dark .modal-card-foot,
+html.theme--documenter-dark #documenter .docs-sidebar ul.docs-menu,
+html.theme--documenter-dark #documenter .docs-sidebar ul.docs-menu li.is-active {
+	background-color: var(--verydark);
+}
+
+html.theme--documenter-dark .docstring,
+html.theme--documenter-dark .docstring>header {
+	background-color: var(--lessdark);
+}
+
+html.theme--documenter-dark .content pre,
+html.theme--documenter-dark pre {
+	background-color: var(--lessdark);
+	border: 0.5px solid hsla(237, 20%, 10%, 0.3) !important;
+}
+
+html.theme--documenter-dark a {
+	color: var(--signage);
+}
+
+html.theme--documenter-dark .modal-card-head {
+	border: none;
+}
+
+
+.schemename {
+	font-family: "JuliaMono";
+}
+
+.swatch {}
+
 .category {
 	font-family: "JuliaMono";
-    font-size: 0.8em;
+	font-size: 0.8em;
 }
 
-html.theme--documenter-dark p > code {
-	  	color: #eff !important;
+html.theme--documenter-dark p>code {
+	color: #eff !important;
 }
 
-html.theme--documenter-dark li > code {
-	  	color: #eff !important;
+
+html.theme--documenter-dark li>code {
+	color: #eff !important;
 }
 
 
-html.theme--documenter-dark a > code {
-	  	color: #eff !important;
+html.theme--documenter-dark a>code {
+	color: #eff !important;
+}
+
+html.theme--documenter-dark p>a {
+	color: #eff !important;
 }
 
-html.theme--documenter-dark p > a {
-	  	color: #eff !important;
+html.theme--documenter-dark .select select:focus,
+html.theme--documenter-dark .textarea:focus,
+html.theme--documenter-dark .input:focus,
+html.theme--documenter-dark #documenter .docs-sidebar form.docs-search>input:focus,
+html.theme--documenter-dark .select select.is-focused,
+html.theme--documenter-dark .is-focused.textarea,
+html.theme--documenter-dark .is-focused.input,
+html.theme--documenter-dark #documenter .docs-sidebar form.docs-search>input.is-focused,
+html.theme--documenter-dark .select select:active,
+html.theme--documenter-dark .textarea:active,
+html.theme--documenter-dark .input:active,
+html.theme--documenter-dark #documenter .docs-sidebar form.docs-search>input:active,
+html.theme--documenter-dark .select select.is-active,
+html.theme--documenter-dark .is-active.textarea,
+html.theme--documenter-dark .is-active.input,
+html.theme--documenter-dark #documenter .docs-sidebar form.docs-search>input.is-active {
+	border-color: var(--signage);
 }
diff --git a/docs/src/convertingimages.md b/docs/src/convertingimages.md
index c1e23ab..dcec316 100644
--- a/docs/src/convertingimages.md
+++ b/docs/src/convertingimages.md
@@ -8,7 +8,7 @@ It's possible to convert an image using one color scheme to use another.
 
 In the following figure, the Julia logo is converted to use a ColorScheme with no black or white:
 
-```
+```julia
 using FileIO, ColorSchemes, ColorSchemeTools, Images
 
 img = load("julia-logo-square.png")
diff --git a/docs/src/makingschemes.md b/docs/src/makingschemes.md
index 613719a..05b70b4 100644
--- a/docs/src/makingschemes.md
+++ b/docs/src/makingschemes.md
@@ -1,5 +1,39 @@
 ```@setup drawscheme
 using Luxor, Colors, ColorSchemes, ColorSchemeTools
+
+function draw_transparent(cs::ColorScheme, csa::ColorScheme,
+    w=800, h=500, filename="/tmp/transparency-levels.svg"
+    )
+    Drawing(w, h, filename)
+    origin()
+    background("black")
+    setlinejoin("bevel")
+
+    N = length(csa.colors) * 2
+    h = w ÷ 4
+    backgroundtiles = Tiler(w, h, 4, N, margin=0)
+    setline(0)
+    for (pos, n) in backgroundtiles
+        if iseven(backgroundtiles.currentrow + backgroundtiles.currentcol) 
+            sethue("grey80")
+        else
+            sethue("grey90")
+        end
+        box(backgroundtiles, n, :fillstroke)
+    end
+    referencecolortiles = Tiler(w, h, 2, N ÷ 2, margin=0)
+    for (pos, n) in referencecolortiles[1:N ÷ 2]
+        setcolor(cs[n])
+        box(referencecolortiles, n, :fillstroke)
+    end
+    for (i, (pos, n)) in enumerate(referencecolortiles[N ÷ 2 + 1 : end])
+        setcolor(csa[i])
+        box(referencecolortiles, n, :fillstroke)
+    end
+    finish()
+    nothing
+end
+
 function draw_rgb_levels(cs::ColorScheme, w=800, h=500, filename="/tmp/rgb-levels.svg")
     # This function is a quick hack to draw swatches and curves in a documenter pass.
     # The diagrams are merely illustrative, not 100% technically precise :(
@@ -45,6 +79,7 @@ function draw_rgb_levels(cs::ColorScheme, w=800, h=500, filename="/tmp/rgb-level
         redline = Point[]
         greenline = Point[]
         blueline = Point[]
+        alphaline = Point[]
         verticalscale=boxheight(bbox)
         stepping = 0.0025
         # TODO better way to examine quantized color values
@@ -54,10 +89,12 @@ function draw_rgb_levels(cs::ColorScheme, w=800, h=500, filename="/tmp/rgb-level
             r = red(c)
             g = green(c)
             b = blue(c)
+            a = alpha(c)
             x = rescale(i, 0, 1, -boxwidth(bbox)/2, boxwidth(bbox)/2)
             push!(redline, Point(x, boxbottomcenter(bbox).y - verticalscale * r))
             push!(greenline, Point(x, boxbottomcenter(bbox).y - verticalscale * g))
             push!(blueline, Point(x, boxbottomcenter(bbox).y - verticalscale * b))        
+            push!(alphaline, Point(x, boxbottomcenter(bbox).y - verticalscale * a))        
         end
         # the idea to make the lines different weights to assist reading overlaps may not be a good one
         setline(1)
@@ -69,6 +106,9 @@ function draw_rgb_levels(cs::ColorScheme, w=800, h=500, filename="/tmp/rgb-level
         setline(0.7)
         sethue("green")
         poly(greenline, :stroke)
+        setline(0.4)
+        sethue("grey50")
+        poly(alphaline, :stroke)
     end
 
     # top tile, swatches
@@ -82,7 +122,7 @@ function draw_rgb_levels(cs::ColorScheme, w=800, h=500, filename="/tmp/rgb-level
         swatchwidth = panewidth/l
         for (i, p) in enumerate(cs.colors)
             swatchcenter = Point(boxtopleft(bbox).x - swatchwidth/2 + (i * swatchwidth) , O.y)
-            sethue(p)
+            setcolor(p)
             box(swatchcenter, swatchwidth - 1, table.rowheights[1]/2 - 1,  :fill)
             @layer begin
                 setline(0.4)
@@ -94,13 +134,14 @@ function draw_rgb_levels(cs::ColorScheme, w=800, h=500, filename="/tmp/rgb-level
 
     # third tile, continuous sampling
     @layer begin
+        setline(0)
         translate(table[3])
         # draw blend
         stepping = 0.0005
         boxw = panewidth * stepping
         for i in 0:stepping:1
             c = get(cs, i)
-            sethue(c)
+            setcolor(c)
             xpos = rescale(i, 0, 1, O.x - panewidth/2, O.x + panewidth/2 - boxw)
             box(Point(xpos + boxw/2, O.y), boxw, table.rowheights[3]/2, :fillstroke)
         end
@@ -132,7 +173,7 @@ You can supply the color specifications using different methods, depending on th
 - an 'indexed list' of RGB values
 - three Julia functions that generate values between 0 and 1 for the RGB levels
 
-The diagrams in this section show: the elements of a colorscheme as individual swatches along the top; the changing RGB curves in the middle; and a continuously-sampled gradient below.
+The diagrams in this section show: the elements of a colorscheme as individual swatches along the top; the changing RGBA curves in the middle; and a continuously-sampled gradient below.
 
 ## List of colors
 
@@ -387,7 +428,47 @@ nothing # hide
 
 !["functional color schemes"](assets/figures/funcscheme6.svg)
 
+## Changing alpha opacity of colorschemes
+
+Usually, colorschemes are RGB values with no alpha values.
+Use `add_alpha()` to add alpha opacity values to colorschemes. 
+
+In the illustrations, the top row shows the original colorscheme, the bottom row shows the modified colorscheme drawn over a checkerboard pattern to show the alpha opacity.
+
+You can make a new colorscheme where every color now has a specific alpha opacity value:
+
+```@example drawscheme
+cs = ColorSchemes.PRGn_10
+csa = add_alpha(cs, 0.8)
+draw_transparent(cs, csa, 800, 200, "assets/figures/funcscheme7.svg") # hide
+nothing # hide
+```
+
+!["functional color schemes"](assets/figures/funcscheme7.svg)
+
+You can specify alpha values using a range:
+
+```@example drawscheme
+cs = ColorSchemes.lisbon10
+csa = add_alpha(cs, 0.3:0.1:1.0)
+draw_transparent(cs, csa, 800, 200, "assets/figures/funcscheme8.svg") # hide
+nothing # hide
+```
+
+!["functional color schemes"](assets/figures/funcscheme8.svg)
+
+Or you can specify alpha values using a function that returns a value for every value between 0 and 1. In the next example the opacity varies from 1.0 to 0.0 and back to 1.0 again, as the colorscheme index goes from 0 to 1; at point 0.5, `abs(cos(0.5 * π))` is 0.0, so the colorscheme is completely transparent at that point.
+
+```@example drawscheme
+cs = ColorSchemes.PuOr
+csa = add_alpha(cs, (n) -> abs(cos(n * π)))
+draw_transparent(cs, csa, 800, 200, "assets/figures/funcscheme9.svg") # hide
+nothing # hide
+```
+
+!["functional color schemes"](assets/figures/funcscheme9.svg)
 
 ```@docs
 make_colorscheme
+add_alpha
 ```
diff --git a/src/ColorSchemeTools.jl b/src/ColorSchemeTools.jl
index fa167cf..5d34bab 100644
--- a/src/ColorSchemeTools.jl
+++ b/src/ColorSchemeTools.jl
@@ -23,6 +23,7 @@ export
     image_to_swatch,
     sortcolorscheme,
     make_colorscheme,
+    add_alpha,
     get_linear_segment_color,
     get_indexed_list_color
 
@@ -465,15 +466,17 @@ function make_colorscheme(indexedlist::Tuple;
 end
 
 """
-    make_colorscheme_new(f1::Function, f2::Function, f3::Function;
+    make_colorscheme(f1::Function, f2::Function, f3::Function;
         model    = :RGB,
         length   = 100,
         category = "",
         notes    = "functional ColorScheme")
 
-Make a colorscheme using functions. Each function should take a value between 0
-and 1 and return for that color component at each point on the colorscheme,
-depending on the color model.
+Make a colorscheme using functions. Each argument is a function that returns a
+value for the red, green, and blue components for the values between 0
+and 1.
+
+`model` is the color model, and can be `:RGB`, `:HSV`, or `:LCHab`.
 
 Use `length` keyword to set the number of colors in the colorscheme.
 
@@ -495,12 +498,22 @@ For the `:LCHab` color model:
 - f1 - [0.0 - 100.0] - luminance
 - f2 - [0.0 - 100.0] - chroma
 - f3 - [0.0 - 360.0] - hue
+
+### Example
+
+Make a colorscheme with the red component defined as a sine curve running  from
+0 to π and back to 0, the green component is always 0, and the blue component starts at
+π and goes to 0 at 0.5 (it's clamped to 0 after that).
+
+```julia
+make_colorscheme(n -> sin(n * π), n -> 0, n -> cos(n * π))
+```
 """
 function make_colorscheme(f1::Function, f2::Function, f3::Function;
-    model=:RGB,
-    length=100,
-    category="",
-    notes="functional ColorScheme")
+        model=:RGB,
+        length=100,
+        category="",
+        notes="functional ColorScheme")
     # output is always RGB for the moment
     cs = RGB[]
     if model == :LCHab
@@ -518,10 +531,9 @@ function make_colorscheme(f1::Function, f2::Function, f3::Function;
     end
     counter = 0
     for i in range(0.0, stop=1.0, length=length)
-        raw1, raw2, raw3 = f1(i), f2(i), f3(i)
-        final1 = clamp(raw1, clamp1...)
-        final2 = clamp(raw2, clamp2...)
-        final3 = clamp(raw3, clamp3...)
+        final1 = clamp(f1(i), clamp1...)
+        final2 = clamp(f2(i), clamp2...)
+        final3 = clamp(f3(i), clamp3...)
         if model == :LCHab
             push!(cs, convert(RGB, LCHab(final1, final2, final3)))
         elseif model == :RGB
@@ -533,6 +545,96 @@ function make_colorscheme(f1::Function, f2::Function, f3::Function;
     return ColorScheme(cs, category, notes)
 end
 
+"""
+    make_colorscheme(f1::Function, f2::Function, f3::Function, f4::Function;
+        model    = :RGBA,
+        length   = 100,
+        category = "",
+        notes    = "functional ColorScheme")
+
+Make a colorscheme with transparency using functions. Each argument is a
+function that returns a value for the red, green, blue, and alpha components for
+the values between 0 and 1.
+
+`model` is the color model, and can be `:RGBA`, `:HSVA`, or `:LCHabA`.
+
+Use `length` keyword to set the number of colors in the colorscheme.
+
+The default color mo            del is `:RGBA`, and the functions should return values in the
+appropriate range:
+
+- f1 - [0.0 - 1.0]   - red
+- f2 - [0.0 - 1.0]   - green
+- f3 - [0.0 - 1.0]   - blue
+- f4 - [0.0 - 1.0]   - alpha
+
+For the `:HSVA` color model:
+
+- f1 - [0.0 - 360.0] - hue
+- f2 - [0.0 - 1.0]   - saturataion
+- f3 - [0.0 - 1.0]   - value (brightness)
+- f4 - [0.0 - 1.0]   - alpha
+
+For the `:LCHabA` color model:
+
+- f1 - [0.0 - 100.0] - luminance
+- f2 - [0.0 - 100.0] - chroma
+- f3 - [0.0 - 360.0] - hue
+- f4 - [0.0 - 1.0]   - alpha
+
+## Examples
+
+
+
+```julia
+csa = make_colorscheme1(
+    n -> red(get(ColorSchemes.leonardo, n)), 
+    n -> green(get(ColorSchemes.leonardo, n)), 
+    n -> blue(get(ColorSchemes.leonardo, n)), 
+    n -> 1 - identity(n))
+
+```
+"""
+function make_colorscheme(f1::Function, f2::Function, f3::Function, f4::Function;
+        model=:RGBA,
+        length=100,
+        category="",
+        notes="functional ColorScheme")
+    # output is always RGBA
+    cs = RGBA[]
+    if model == :LCHabA
+        clamp1 = (0.0, 100.0) #
+        clamp2 = (0.0, 100.0) #
+        clamp3 = (0.0, 360.0) # Hue is 0-360
+        clamp4 = (0.0, 1.0)
+    elseif model == :HSVA
+        clamp1 = (0.0, 360.0) # Hue is 0-360
+        clamp2 = (0.0, 1.0) #
+        clamp3 = (0.0, 1.0) #
+        clamp4 = (0.0, 1.0)
+    elseif model == :RGBA
+        clamp1 = (0.0, 1.0) #
+        clamp2 = (0.0, 1.0) #
+        clamp3 = (0.0, 1.0) #
+        clamp4 = (0.0, 1.0)
+    end
+    counter = 0
+    for i in range(0.0, stop=1.0, length=length)
+        final1 = clamp(f1(i), clamp1...)
+        final2 = clamp(f2(i), clamp2...)
+        final3 = clamp(f3(i), clamp3...)
+        final4 = clamp(f4(i), clamp4...)
+        if model == :LCHabA
+            push!(cs, convert(RGBA, LCHab(final1, final2, final3, final4)))
+        elseif model == :RGBA
+            push!(cs, RGBA(final1, final2, final3, final4))
+        elseif model == :HSVA
+            push!(cs, convert(RGBA, HSVA(final1, final2, final3, final4)))
+        end
+    end
+    return ColorScheme(cs, category, notes)
+end
+
 """
     make_colorscheme(colorlist, steps)
 
@@ -563,4 +665,115 @@ function make_colorscheme(colorlist::Array, steps)
     return ColorScheme(colors, "interpolated gradient", "$steps")
 end
 
+"""
+    add_alpha(cs::ColorScheme, alpha::Real=0.5)
+
+Make a copy of the colorscheme `cs` with alpha opacity value `alpha`.
+
+### Example
+
+Make a copy of the PuOr colorscheme and set every element of it to have alpha
+opacity 0.5
+
+```julia
+add_alpha(ColorSchemes.PuOr, 0.5)
+```
+"""
+function add_alpha(cs::ColorScheme, alpha::Real=0.5)
+    return make_colorscheme(
+        n -> red(get(cs, n)),
+        n -> green(get(cs, n)),
+        n -> blue(get(cs, n)),
+        n -> alpha,
+        model=:RGBA,
+        length=length(cs.colors),
+        category=cs.category,
+        notes=cs.notes * " with alpha"
+    )
+end
+
+"""
+    add_alpha(cs::ColorScheme, alpha::Vector)
+
+Make a copy of the colorscheme `cs` with alpha opacity values in the vector
+`alpha`.
+
+### Example
+
+Make a copy of the PuOr colorscheme, set the first element to have alpha
+opacity 1.0, the last element to have opacity 0.0, with intermediate elements
+taking values between 1.0 and 0.0.
+
+```julia
+add_alpha(ColorSchemes.PuOr, [1.0, 0.0])
+```
+"""
+function add_alpha(cs::ColorScheme, alpha::Vector)
+    alphanodes = (range(0, 1, length=length(alpha)),)
+    itpalpha = interpolate(alphanodes, 
+        range(alpha[1], alpha[end], length=length(alpha)), 
+        Gridded(Linear()))
+    return make_colorscheme(
+        n -> red(get(cs, n)),
+        n -> green(get(cs, n)),
+        n -> blue(get(cs, n)),
+        n -> itpalpha(n),
+        model=:RGBA,
+        length=length(cs.colors),
+        category=cs.category,
+        notes=cs.notes * " with alpha"
+    )
+end
+
+"""
+    add_alpha(cs::ColorScheme, r::Range)
+
+Make a copy of the colorscheme `cs` with alpha opacity values in the range `r`.
+
+### Example
+
+Make a copy of the PuOr colorscheme, set the first element to have alpha
+opacity 0.5, the last element to have opacity 0.0, with intermediate elements
+taking values between 0.5 and 1.0.
+
+```julia
+add_alpha(ColorSchemes.PuOr, 0.5:0.1:1.0)
+```
+"""
+function add_alpha(cs::ColorScheme, r::T where T <: AbstractRange)
+    if length(r) == 1
+        throw(error("add_alpha: range $(r) should be have more than one step."))
+    end
+    add_alpha(cs, collect(r))
+end
+
+"""
+    add_alpha(cs::ColorScheme, f::Function)
+
+Make a copy of the colorscheme `cs` with alpha opacity values defined by the
+function.
+
+### Example
+
+Make a copy of the PuOr colorscheme, set the opacity of each element to be the
+result of calling the function on the value. So at value 0.5, the opacity is
+1.0, but it's 0.0 at either end.
+
+```julia
+add_alpha(ColorSchemes.PuOr, (n) -> sin(n * π))
+```
+"""
+function add_alpha(cs::ColorScheme, f::Function)
+    return make_colorscheme(
+        n -> red(get(cs, n)),
+        n -> green(get(cs, n)),
+        n -> blue(get(cs, n)),
+        n -> f(n),
+        model=:RGBA,
+        length=length(cs.colors),
+        category=cs.category,
+        notes=cs.notes * " with alpha"
+    )
+end
+
 end
diff --git a/test/runtests.jl b/test/runtests.jl
index 2ff4716..f3dbe2c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -102,6 +102,27 @@ function run_all_tests()
         @test s1.colors == s2.colors
     end
 
+    @testset "add_alpha tests" begin
+        csa = add_alpha(ColorSchemes.plasma, 0.5)
+        # all alpha = 0.5
+        @test all(isequal(0.5), getfield.(csa.colors, :alpha)) == true
+
+        csa = add_alpha(ColorSchemes.plasma, [0.8, 1.0])
+        # all alpha between 0.8 and 1.0
+        @test all(>=(0.8), getfield.(csa.colors, :alpha))
+
+        csa = add_alpha(ColorSchemes.plasma, [1.0, 0.8])
+        # all alpha > 0.8
+        @test all(>=(0.8), getfield.(csa.colors, :alpha))
+
+        csa = add_alpha(ColorSchemes.plasma, (n) -> sin(n * π))
+        # all alphas close to sin(n π)
+        for (i, a) in enumerate(csa.colors)
+            a, b = sin(i / 256 * π), a.alpha
+            @test abs(a - b) < 0.1
+        end
+    end
+
 end
 
 function run_minimum_tests()