Ed McManus 3957372ded Retain alpha in pil_resize ...

Currently the alpha channel is dropped by `pil_resize()` when `--alpha_mask` is supplied and the image width does not exceed the bucket.

This codepath is entered on the last line, here:
```
def trim_and_resize_if_required(
    random_crop: bool, image: np.ndarray, reso, resized_size: Tuple[int, int]
) -> Tuple[np.ndarray, Tuple[int, int], Tuple[int, int, int, int]]:
    image_height, image_width = image.shape[0:2]
    original_size = (image_width, image_height)  # size before resize

    if image_width != resized_size[0] or image_height != resized_size[1]:
        # リサイズする
        if image_width > resized_size[0] and image_height > resized_size[1]:
            image = cv2.resize(image, resized_size, interpolation=cv2.INTER_AREA)  # INTER_AREAでやりたいのでcv2でリサイズ
        else:
            image = pil_resize(image, resized_size)
```

2024-09-19 14:30:03 -07:00

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