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add difference blend mode #1909

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merged 1 commit into from
Nov 7, 2023
Merged

add difference blend mode #1909

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4 changes: 3 additions & 1 deletion comfy_extras/nodes_post_processing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,7 @@ def INPUT_TYPES(s):
"max": 1.0,
"step": 0.01
}),
"blend_mode": (["normal", "multiply", "screen", "overlay", "soft_light"],),
"blend_mode": (["normal", "multiply", "screen", "overlay", "soft_light", "difference"],),
},
}

Expand Down Expand Up @@ -54,6 +54,8 @@ def blend_mode(self, img1, img2, mode):
return torch.where(img1 <= 0.5, 2 * img1 * img2, 1 - 2 * (1 - img1) * (1 - img2))
elif mode == "soft_light":
return torch.where(img2 <= 0.5, img1 - (1 - 2 * img2) * img1 * (1 - img1), img1 + (2 * img2 - 1) * (self.g(img1) - img1))
elif mode == "difference":
return img1 - img2
else:
raise ValueError(f"Unsupported blend mode: {mode}")

Expand Down