如何将numpy数组转换为gif？

Question

假设我有一个4D的numpy数组，其中3D子数组是RGB图像。如何将其转换为gif格式？我希望只依赖于Python中众所周知的图像处理库。

示例数据：

import numpy as np
imgs = np.random.randint(0, 255, (100, 50, 50, 3), dtype=np.uint8)

- Nathan

Answer 1

使用PIL很简单：

import numpy as np
from PIL import Image

imgs = np.random.randint(0, 255, (100, 50, 50, 3), dtype=np.uint8)
imgs = [Image.fromarray(img) for img in imgs]
# duration is the number of milliseconds between frames; this is 40 frames per second
imgs[0].save("array.gif", save_all=True, append_images=imgs[1:], duration=50, loop=0)

- Nathan

Answer 2

你也可以使用ImageMagick和OpenCV从一组图像中制作GIF。

def create_gif(inputPath, outputPath, delay, finalDelay, loop):
    # grab all image paths in the input directory
    imagePaths = sorted(list(paths.list_images(inputPath)))
    
    # remove the last image path in the list
    lastPath = imagePaths[-1]
    imagePaths = imagePaths[:-1]
    # construct the image magick 'convert' command that will be used
    # generate our output GIF, giving a larger delay to the final
    # frame (if so desired)
    cmd = "convert -delay {} {} -delay {} {} -loop {} {}".format(
        delay, " ".join(imagePaths), finalDelay, lastPath, loop,
        outputPath)
    os.system(cmd)

你可以参考pyimagesearch的教程来更加清晰地了解。

- Sreekiran A R

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如果示例展示如何从问题中的示例数据获取gif，那将更好。一个纯Python解决方案也比仅使用Python作为命令行包装器更好。 - Nathan