both

Author: radarhere

src/PIL/ImageOps.py

@@ -675,7 +675,7 @@ def sobel(image: Image.Image) -> Image.Image:
             for dy in (-1, 0, 1):
                 for dx in (-1, 0, 1):
                     v = image.getpixel((x + dx, y + dy))
-                    assert isinstance(v, float)
+                    assert isinstance(v, (int, float))
 
                     gx += v * Kx[dy + 1][dx + 1]
                     gy += v * Ky[dy + 1][dx + 1]