使用PIL从任何图像中删除透明度/ alpha

如何用指定的背景颜色替换任何图像(png,jpg,rgb,rbga)的alpha通道？它还必须适用于没有Alpha通道的图像.

解决方法

def remove_transparency(im,bg_colour=(255,255,255)):

    # Only process if image has transparency (https://stackoverflow.com/a/1963146)
    if im.mode in ('RGBA','LA') or (im.mode == 'P' and 'transparency' in im.info):

        # Need to convert to RGBA if LA format due to a bug in PIL (https://stackoverflow.com/a/1963146)
        alpha = im.convert('RGBA').split()[-1]

        # Create a new background image of our matt color.
        # Must be RGBA because paste requires both images have the same format
        # (https://stackoverflow.com/a/8720632  and  https://stackoverflow.com/a/9459208)
        bg = Image.new("RGBA",im.size,bg_colour + (255,))
        bg.paste(im,mask=alpha)
        return bg

    else:
        return im

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