python提取图像的每一帧

原文：http://blog.youkuaiyun.com/u011500307/article/details/28163389

import os

from PIL import Image

def analyseImage(path):
    im = Image.open(path)
    results = {
        'size': im.size,
        'mode': 'full',
    }
    try:
        while True:
            if im.tile:
                tile = im.tile[0]
                update_region = tile[1]
                update_region_dimensions = update_region[2:]
                if update_region_dimensions != im.size:
                    results['mode'] = 'partial'
                    break
            im.seek(im.tell() + 1)
    except EOFError:
        pass
    return results

def processImage(path):
    mode = analyseImage(path)['mode']
    im = Image.open(path)
    i = 0
    p = im.getpalette()
    last_frame = im.convert('RGBA')
    try:
        while 1:
            print("saving %s (%s) frame %d, %s %s" % (path, mode, i, im.size, im.tile))

            ''''' 
            If the GIF uses local colour tables, each frame will have its own palette. 
            If not, we need to apply the global palette to the new frame. 
            '''
            if not im.getpalette():
                im.putpalette(p)

            new_frame = Image.new('RGBA', im.size)

            ''''' 
            Is this file a "partial"-mode GIF where frames update a region of a different size to the entire image? 
            If so, we need to construct the new frame by pasting it on top of the preceding frames. 
            '''
            if mode == 'partial':
                new_frame.paste(last_frame)
            new_frame.paste(im, (0, 0), im.convert('RGBA'))
            new_frame.save('%s-%d.png' % (''.join(os.path.basename(path).split('.')[:-1]), i), 'PNG')
            i += 1
            last_frame = new_frame
            im.seek(im.tell() + 1)
    except EOFError:
        pass
if __name__ == "__main__":
    processImage('j8ks.gif')