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utils: fix lanczos grayscale upscaling (#11873)

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rattus 2026-01-14 14:53:16 -08:00 committed by GitHub
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comfy/utils.py
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@ -929,7 +929,9 @@ def bislerp(samples, width, height):
return result.to(orig_dtype)
def lanczos(samples, width, height):
images = [Image.fromarray(np.clip(255. * image.movedim(0, -1).cpu().numpy(), 0, 255).astype(np.uint8)) for image in samples]
#the below API is strict and expects grayscale to be squeezed
samples = samples.squeeze(1) if samples.shape[1] == 1 else samples.movedim(1, -1)
images = [Image.fromarray(np.clip(255. * image.cpu().numpy(), 0, 255).astype(np.uint8)) for image in samples]
images = [image.resize((width, height), resample=Image.Resampling.LANCZOS) for image in images]
images = [torch.from_numpy(np.array(image).astype(np.float32) / 255.0).movedim(-1, 0) for image in images]
result = torch.stack(images)