[英]Generating an animated GIF in Python
我正在尝试使用images2gif.py生成动画GIF(pastebin到最近的版本:bit.ly/XMMn5h)。
我正在使用这个Python脚本:
__author__ = 'Robert'
from images2gif import writeGif
from PIL import Image
import os
file_names = sorted((fn for fn in os.listdir('.') if fn.endswith('.gif')))
#['animationframa.png', 'animationframb.png', ...] "
images = [Image.open(fn) for fn in file_names]
size = (150,150)
for im in images:
im.thumbnail(size, Image.ANTIALIAS)
print writeGif.__doc__
filename = "my_gif.GIF"
writeGif(filename, images, duration=0.2)
但是,我收到以下错误:
File "C:\Python27\lib\images2gif.py" , line 418, in writeGifToFile
globalPalette = palettes[ occur.index(max(occur)) ] ValueError: max()
arg is an empty sequence
在我看来,发生是空的。 有什么问题,还有更好的方法吗?
好的,我已经在两台不同的机器上测试了您的确切代码,并且它在两者上都运行良好。 一台机器是Ubuntu 12.04,另一台机器运行Windows XP。 他们都使用Python 2.7,以及我从这里下载的最新版本的images2gif。 我推荐以下内容:
Python,从代表图像的numpy ndarray的numpy ndarray创建一个.gif文件:
import os
import numpy as np
from moviepy.editor import ImageSequenceClip
#Installation instructions:
# pip install numpy
# pip install moviepy
# Moviepy needs ffmpeg tools on your system
# (I got mine with opencv2 installed with ffmpeg support)
def create_gif(filename, array, fps=10, scale=1.0):
"""creates a gif given a stack of ndarray using moviepy
Parameters
----------
filename : string
The filename of the gif to write to
array : array_like
A numpy array that contains a sequence of images
fps : int
frames per second (default: 10)
scale : float
how much to rescale each image by (default: 1.0)
"""
fname, _ = os.path.splitext(filename) #split the extension by last period
filename = fname + '.gif' #ensure the .gif extension
if array.ndim == 3: #If number of dimensions are 3,
array = array[..., np.newaxis] * np.ones(3) #copy into the color
#dimension if images are
#black and white
clip = ImageSequenceClip(list(array), fps=fps).resize(scale)
clip.write_gif(filename, fps=fps)
return clip
randomimage = np.random.randn(100, 64, 64)
create_gif('test.gif', randomimage) #example 1
myimage = np.ones(shape=(300, 200))
myimage[:] = 25
myimage2 = np.ones(shape=(300, 200))
myimage2[:] = 85
arrayOfNdarray = np.array([myimage, myimage2])
create_gif(filename="grey_then_black.gif", #example 2
array=arrayOfNdarray,
fps=5,
scale=1.3)
打印:
[MoviePy] Building file test.gif with imageio
100%|██████████████████████████████████████████| 100/100 [00:00<00:00, 905.27it/s]
[MoviePy] Building file grey_then_black.gif with imageio
67%|█████████████████████████▎ | 2/3 [00:00<00:00, 65.65it/s]
在列表构造函数中
(fn for fn in os.listdir('.') if fn.endswith('.gif'))
endswith区分大小写,所以如果您碰巧拥有所有GIF图像,那么它们将无法找到,您将获得
ValueError: max() arg is an empty sequence
错误。
我建议使用
(fn for fn in os.listdir('.') if fn.endswith('.gif') or fn.endswith('.GIF'))
为此成功。 此外,在父(或至少另一个)目录中创建动画gif文件是个好主意。
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