使用PIL库进行gif图的解析或合成

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Words count in article: 664 | Reading time ≈ 3

那个星夜越过千年
而我绕过半个地球
重新来寻那个你
那个亮尽我的眼的你
一颗流星划过
坠入无边黑暗
你等我一千年
我找你十万里
——《星空》湮夫

跨界艺术家插画师James R. Eads的画作，似乎一下子游离到了另一个世界。在他的笔下，一个个创思化身成一个个闪光的光点，五彩缤纷，随意萦绕，勾勒出一个个美轮美奂的画境，似有阳光的热烈，也有月光的浪漫，更有浩瀚星光似的唯美与空明，让人很容易就沉浸在这美妙的小宇宙中。

受梵高的绘画风格影响，他巧妙地将色彩与富有动感的笔触结合起来，使画面梦幻而富有冲击力。神秘缤纷的色彩、浩瀚如宇宙的笔触，自然与人就这样被James R. Eads用独特的绘画方法结合在一起，启发著人们去思考人与人、人与自然之间的关系。

欣赏作品：








我们尝试利用PIL库将gif图进行解析， 然后再重新合成gif图， 并改变帧的变化速率。

解析gif图代码：

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#-*- coding: UTF-8 -*-  
 
import os
from PIL import Image
 
def analyseImage(path):
    '''
    Pre-process pass over the image to determine the mode (full or additive).
    Necessary as assessing single frames isn't reliable. Need to know the mode 
    before processing all frames.
    '''
    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):
    '''
    Iterate the GIF, extracting each frame.
    '''
    mode = analyseImage(path)['mode']
    
    im = Image.open(path)
 
    i = 0
    p = im.getpalette()
    last_frame = im.convert('RGBA')
    
    try:
        while True:
            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
 
 
 
def main():
    processImage('1.gif')
    
 
if __name__ == "__main__":
    main()

合成gif图代码：

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#-*- coding: UTF-8 -*-  
 
import imageio
 
def create_gif(image_list, gif_name):
 
    frames = []
    for image_name in image_list:
        frames.append(imageio.imread(image_name))
    # Save them as frames into a gif 
    imageio.mimsave(gif_name, frames, 'GIF', duration = 0.1)
 
    return
 
def main():
    image_list = ['1-0.png', '1-2.png', '1-4.png', 
                  '1-6.png', '1-8.png', '1-10.png']
    gif_name = 'created_gif1.gif'
    create_gif(image_list, gif_name)
 
if __name__ == "__main__":
    main()

某gif图解析后部分图片如下：



gif图合成后：


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