diff --git a/src/lib.rs b/src/lib.rs
index b1c0fa7..13dbb2c 100755
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -69,7 +69,7 @@ pub fn run(opt: &Opt) -> anyhow::Result<()> {
             .unzip()
     };
 
-    let images_for_ocr = preprocessor::process_images_for_ocr(idx, images, opt.border)?;
+    let images_for_ocr = preprocessor::process_images_for_ocr(idx, images, opt.border);
 
     // Dump images if requested.
     if opt.dump {
diff --git a/src/preprocessor.rs b/src/preprocessor.rs
index b6d607a..097f98a 100644
--- a/src/preprocessor.rs
+++ b/src/preprocessor.rs
@@ -3,16 +3,11 @@ use rayon::prelude::*;
 use subtile::{
     image::{ToOcrImage, ToOcrImageOpt},
     vobsub::{self, VobSubIndexedImage, VobSubOcrImage},
-    SubtileError,
 };
 
 /// Return a vector of processed images for OCR.
 #[profiling::function]
-pub fn process_images_for_ocr<I>(
-    idx: vobsub::Index,
-    images: I,
-    border: u32,
-) -> Result<Vec<GrayImage>, SubtileError>
+pub fn process_images_for_ocr<I>(idx: vobsub::Index, images: I, border: u32) -> Vec<GrayImage>
 where
     I: IntoParallelIterator<Item = VobSubIndexedImage>,
 {
@@ -21,14 +16,13 @@ where
         ..Default::default()
     };
     let palette = rgb_palette_to_luminance(idx.palette());
-    let result = images
+    images
         .into_par_iter()
         .map(|vobsub_img| {
             let converter = VobSubOcrImage::new(&vobsub_img, &palette);
             converter.image(&opt)
         })
-        .collect();
-    Ok(result)
+        .collect()
 }
 
 /// Convert an sRGB palette to a luminance palette.