diff --git a/Source/Color.c b/Source/Color.c
index 485205d..276a2f4 100644
--- a/Source/Color.c
+++ b/Source/Color.c
@@ -129,10 +129,15 @@ int Calc(UINT x, UINT y)
     cr = graph.x0 + (x - (double)display.width / 2) / display.mlen * graph.size;
     ci = graph.y0 + (y - (double)display.height / 2) / display.mlen * graph.size;
     for (i = 0; i <= (int)graph.limit; i++) {
-        if (zr * zr + zi * zi > 4) return i;
+        //if (zr * zr * zr * zr + zi * zi * zi * zi> 4) return i;
+        //tmp = zr * zr * zr * zr - zi * zi * zi *zi + cr;
+        if (zr * zr + zi * zi> 4) return i;
         tmp = zr * zr - zi * zi + cr;
         zi = 2 * zr * zi + ci;
         zr = tmp;
+        //tmp = (zr * zr - zi * zi) * zr - (2 * zr * zi + ci) * zi + cr;
+        //zi = 2 * (zr * zr - zi * zi) * (2 * zr * zi + ci) + ci;
+        //zr = tmp;
     }
     return -1;
 }
\ No newline at end of file
diff --git a/Source/Main.c b/Source/Main.c
index e70a6ed..1b72469 100644
--- a/Source/Main.c
+++ b/Source/Main.c
@@ -180,7 +180,10 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
         lpPixel = (LPDWORD)HeapAlloc(
             GetProcessHeap(), HEAP_ZERO_MEMORY,
             //display.width * display.height * 4
-            GetSystemMetrics(SM_CXSCREEN) * GetSystemMetrics(SM_CYSCREEN) * 4
+            max(
+                GetSystemMetrics(SM_CXSCREEN) * GetSystemMetrics(SM_CYSCREEN),
+                2000 * 2000
+            ) * 4 * 4
         );
         // DIBの情報を設定する
         bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);