resize_emotion.py

def resize(file_path):

    # import pdb; pdb.set_trace()
    save_path = os.getcwd() + "/tmp/xxx.gif"

    im = Image.open(file_path)

    if im.format == 'GIF':
        # rename file
        new_file_path = file_path.split('.')[0] + '.gif'
        os.rename(file_path, new_file_path)
        return new_file_path.split('\\')[-1], new_file_path

    if 'transparency' in im.info:
        transparency = im.info['transparency']
        im.save(save_path, transparency=transparency)
    else:
        # Get the alpha band
        alpha = im.split()[3]

        # Convert the image into P mode but only use 255 colors in the palette out of 256
        im = im.convert('RGB').convert('P', palette=Image.ADAPTIVE, colors=255)

        # Set all pixel values below 128 to 255,
        # and the rest to 0
        mask = Image.eval(alpha, lambda a: 255 if a <=128 else 0)

        # Paste the color of index 255 and use alpha as a mask
        im.paste(255, mask)
        # The transparency index is 255
        im.save(save_path, transparency=255)

    fp = open(save_path, 'r')
    file_name = md5_file_name(fp, 'gif')
    fp.close()
    return file_name, save_path