action

debug_dither.py

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+from PIL import Image, ImageDraw
+
+# Create a test image with gray lines
+img = Image.new('L', (100, 100), color=255)
+d = ImageDraw.Draw(img)
+d.line([10, 10, 90, 90], fill=128, width=2) # Gray line
+d.line([10, 90, 90, 10], fill=0, width=2)   # Black line
+
+# Convert with default dithering
+img1 = img.convert('1')
+zeros1 = 0
+for y in range(100):
+    for x in range(100):
+        if img1.getpixel((x, y)) == 0: zeros1 += 1
+print(f"Default dither zeros: {zeros1}")
+
+# Convert with NO dithering (Threshold)
+# Note: convert('1', dither=Image.Dither.NONE) might still do dithering in some versions?
+# The reliable way to threshold is point operation or custom threshold.
+# But let's check convert('1', dither=0)
+img2 = img.convert('1', dither=Image.Dither.NONE)
+zeros2 = 0
+for y in range(100):
+    for x in range(100):
+        if img2.getpixel((x, y)) == 0: zeros2 += 1
+print(f"No dither zeros: {zeros2}")
+