Remove transparency/alpha from any image using PIL

Question

How do I replace the alpha channel of any image (png, jpg, rgb, rbga) with specified background color? It must also work with images that do not have an alpha channel.

Answer 1

This can be done by checking if the image is transparent

def remove_transparency(im, bg_colour=(255, 255, 255)):      # Only process if image has transparency (http://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 (http://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         # (http://stackoverflow.com/a/8720632  and  http://stackoverflow.com/a/9459208)         bg = Image.new("RGBA", im.size, bg_colour + (255,))         bg.paste(im, mask=alpha)         return bg      else:         return im 

Answer 2

I'd suggest using Image.alpha_composite.
This code can avoid a tuple index out of range error if png has no alpha channel.

from PIL import Image  png = Image.open(img_path).convert('RGBA') background = Image.new('RGBA', png.size, (255,255,255))  alpha_composite = Image.alpha_composite(background, png) alpha_composite.save('foo.jpg', 'JPEG', quality=80) 

I also recommend you inspect both results with a image.show().

Credits for this answer goes to shuuji3 and others who helped build a vast answers repertoire in this other question.