1/14/2024 0 Comments Imagemagick combine gifs![]() Shrinking the images reduced the size: size = (150,150) #images.extend(reversed(images)) #infinit loop will go backwards and forwards. # Numpy images of other types are expected to have values between 0 and 255. # Numpy images of type float should have pixels between 0 and 1. # images should be a list of numpy arrays of PIL images. # Write an animated gif from the specified images. # writeGif(filename, images, duration=0.1, loops=0, dither=1) Here is the code I used: _author_ = 'Robert'įile_names = sorted((fn for fn in os.listdir('.') if fn.endswith('.png'))) It did seem to double the file size though.Ģ6 110kb PNG files, I expected 26*110kb = 2860kb, but my_gif.GIF was 5.7mbĪlso because the GIF was 8bit, the nice png's became a little fuzzy in the GIF ![]() Tested in Ubuntu 18.10, ffpmeg 4.0.2-2, ImageMagick 6.9.10-8.I used images2gif.py which was easy to use. TODO: why can they make it smaller than convert? Are they just selecting better more minimal diff rectangles, or something else? ![]() See also: How do I create an animated gif from still images (preferably with the command line)? Gifsicle -resize 256x256 out-convert.gif > out-gifsicle.gifĪnd both produced an even smaller correctly looking 1.5 MiB output. I also tried out the following commands: ffmpeg -i out-convert.gif -vf scale=256:-1 out-ffmpeg-small.gif Not considerably smaller than out-coalesce.gif, but I think this is just because the black ground compresses really well, and it could be very significant in general. Out-deconstruct.gif: compressed frames, final output size 1.9 MiB. Output looks visually correct, but the output file size is 2.0 MiB, which is larger than out-deconstruct.gif Out-coalesce.gif: all frames are 256x256 and have the correct offset 0+0. Visually incorrect, since those approximately 256x256 frames have a non-zero offset, e.g. Out.gif: All frames are 256x256 or larger, and huge at about 5MiB, TODO why? Then, if we compare the three conversions: $ identify out-deconstruct.gif | head -n 3 $ convert out-convert.gif -coalesce -resize 256x -deconstruct out-deconstruct.gif $ convert out-convert.gif -coalesce -resize 256x out-coalesce.gif $ convert out-convert.gif -resize 256x out.gif Using the test data from this answer: How do I create an animated gif from still images (preferably with the command line)? we can see this clearly with identify: $ identify out-convert.gif | head -n 3 coalesce then expands all the frames to the original size, which makes the resize work, but it does not re-compress the frames again as your input image: -deconstruct is needed for that! The root cause of the problem is that your input GIF was properly minimized: GIF allows the next frame to be just the modified rectangle from the previous one at an offset. ![]() After -coalesce, you likely want to add a -deconstruct: convert in.gif -coalesce -resize 256x -deconstruct out-deconstruct.gif
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