That being said GIF is not something modern and it has been around ever since it debuted in 1987. Since we have broached the topic of GIF it is but compulsory to talk about the memes that are built with GIF as the cornerstone. Sites like Buzzfeed thrive on content that is crafted with the help of a string of GIF files and so does other entertainment sites. The entire world was hooked to the internet thanks to the funny and quirky cat animations. With the rise in messaging apps like WhatsApp, Facebook Messenger and others the popularity of GIF file has only soared higher. GIF files have been the treasure cove of humour and expression. No, I don’t mean to say that without GIF the internet is doomed but it is definitely a shade duller. This is because anti-aliasing would require semi-transparent colors around the edges, but GIF cannot save the semi-transparent colors generated by the -resize operator.GIF’s or Graphic Interchangeable Format has been pretty much the lifeline of the internet. However, it may still display 'staircase' artifacts when it comes to edges, because the resized frames will be horribly aliased. It would correct problems resulting from this, at the cost of increased file size. This command would work around the frame optimization problems. To still try your luck with running a 'simple' resize command, you could try this: convert \
Undergo a complete GIF optimization sequence for the animation: not just for frame optimization, but also for color optimization. This will create individual images of equal size for all frames of the animation. Generally the best procedure to resize animated GIFs is this:Ĭoalesce (de-optimize) the animation.
Gifsicle resize blurry full#
When the images are saved back to the GIF file format, these pixels are then converted to either full transparency or full opacity: both produce a heavy color distortion for the resulting animation, away from the original color. What happens in this case is this: -resize creates semi-transparent pixels in the overlay images. Transparency is frequently used to even achieve compression optimizations where normally the image's appearance wouldn't require transparency at all.
Then there is the transparency problem: most animated GIFs do make heavy use of transparency. Heavy color reductions in the resized images are the result. Thus the resized images are far from ideal for saving to the limited GIF file format for single images, let alone for multiple frames of an animated GIF. resize handles each and every frame image totally separately from the other images and does not take into account 'frame optimizations' (which have the tendency to create a different width+height for each frame that's placed on the common canvas with its own offset). In an animation sequence, the next image/frame's -resize may result in a completely different color table than the previous one produced - but for a well working animation you'd need a common color table across all frames. This does contradict what GIF is designed for: using a strictly limited color table (maximum of 256 colors). This very often adds new color values to the image. resize is designed for single images, and to make the resulting single image look as good as possible. Both these types of optimizations don't combine well with the -resize operation. There are other optimizations at play too, which do reduce the number of colors used. These variations in the dimensions are the result of frame optimizing the animated GIF has been subjected to in order to reduce file size. If you look at your original GIF with identify, you'll see that not each frame has the same dimensions: identify Qb1m0.gif I assume this is the same for GraphicsMagick, really. It is even difficult to do that if the animated GIF does not contain transparency. It is next to impossible to directly resize animated GIFs with a simple command line (such as the one you gave), if the GIF contains transparency. For ImageMagick the following statements apply: I do know ImageMagick better than GraphicsMagick.
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