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[doc] update inpaint doc to use apply_overlay #6364

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Jan 2, 2024
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[doc] update inpaint doc to use apply_overlay #6364

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15 changes: 2 additions & 13 deletions docs/source/en/using-diffusers/inpaint.md
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Expand Up @@ -318,7 +318,7 @@ make_image_grid([init_image, image], rows=1, cols=2)

The trade-off of using a non-inpaint specific checkpoint is the overall image quality may be lower, but it generally tends to preserve the mask area (that is why you can see the mask outline). The inpaint specific checkpoints are intentionally trained to generate higher quality inpainted images, and that includes creating a more natural transition between the masked and unmasked areas. As a result, these checkpoints are more likely to change your unmasked area.

If preserving the unmasked area is important for your task, you can use the code below to force the unmasked area of an image to remain the same at the expense of some more unnatural transitions between the masked and unmasked areas.
If preserving the unmasked area is important for your task, you can use the `apply_overlay` method of [`VaeImageProcessor`] to force the unmasked area of an image to remain the same at the expense of some more unnatural transitions between the masked and unmasked areas.

```py
import PIL
Expand All @@ -345,18 +345,7 @@ prompt = "Face of a yellow cat, high resolution, sitting on a park bench"
repainted_image = pipeline(prompt=prompt, image=init_image, mask_image=mask_image).images[0]
repainted_image.save("repainted_image.png")

# Convert mask to grayscale NumPy array
mask_image_arr = np.array(mask_image.convert("L"))
# Add a channel dimension to the end of the grayscale mask
mask_image_arr = mask_image_arr[:, :, None]
# Binarize the mask: 1s correspond to the pixels which are repainted
mask_image_arr = mask_image_arr.astype(np.float32) / 255.0
mask_image_arr[mask_image_arr < 0.5] = 0
mask_image_arr[mask_image_arr >= 0.5] = 1

# Take the masked pixels from the repainted image and the unmasked pixels from the initial image
unmasked_unchanged_image_arr = (1 - mask_image_arr) * init_image + mask_image_arr * repainted_image
unmasked_unchanged_image = PIL.Image.fromarray(unmasked_unchanged_image_arr.round().astype("uint8"))
unmasked_unchanged_image = pipeline.image_processor.apply_overlay(mask_image, init_image, repainted_image)
unmasked_unchanged_image.save("force_unmasked_unchanged.png")
make_image_grid([init_image, mask_image, repainted_image, unmasked_unchanged_image], rows=2, cols=2)
```
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