This is the plan, and the goal that this IM Examples section, was lookingįrame optimization is based on overlaying a smaller sub-image This option will also likely become quite slow. Of course as many optimization steps may not be worth the effort for a Until then be careful of its use, especially in scripts as it will In other words, it is hoped that ' Optimize' will eventuallyīecome the IM generic GIF animation optimizer, for quick and easy use by IM Some type of Color Optimization technique.Įxactly what, is still to be decided, and may be selected depending on theĪnimation and the number of colors involved.YouĬan still do the semi-transparency handling yourself before hand to When saving to the GIF file format, to remove semi-transparent pixels. A 50% Threshold of the alpha channel, just as the IM does normally does.Include extra standard optimization steps, such as. The operator however is still in development, and in future is likely to also ' Optimize' operator should produce a good well optimized However for most GIF animations, involving cartoon like images, the Result in a worsening of the LZW compression ratio. Where a Transparency Optimization will generally This is particularly true of an raw video sequence These are reasonably safe optimization steps that can be applied to mostĪnimation sequences, however there is no guarantee, that it will result inĪ smaller GIF animation. and Transparency OptimizationAt which point you can immediately save the GIF animation.Will discuss in detail below, to attempt to optimize a GIF animation in aĬurrently this option is equivalent to (in order). ' Optimize' will use a number of the techniques, that we General Purpose GIF Optimizer of ImageMagick Or you may loose the operators effect on the final GIF file save. Global Color Table has to be done as a the last step before saving to GIF Probably the hardest aspect of optimization that users have trouble with isĬolor Optimizations caused by the color limitations That however is not the order we will look at these optimization techniques.įor GIF animations Frame Optimization is the mostīasic optimization technique, and where the most gains can be made. When optimizing animation you should try to optimize them in the following The ability to use smaller 'sub-frame' overlays from one frame to the next. Restrictions, as well as a choice of different frame disposal techniques, and Optimizing an animation is not easy, especially a GIF animation that has color Where smaller sub-frame overlays can be used, as well as three types ofĭisposal methods controlling how an animation is handled. This is especially important for complex GIF animations These examples start to make use of the BasicĪnimation Handling, to try to optimize the final display and file size
#IMAGEMAGICK OR GIFSICLE SERIES#
The following incantation converts a series of images to a GIF. H.265 is nice, but sometimes you need a more archaic format if you want to share your movie. Settingįor 24 JPG images all at 4,7MB (totaling 112,8MB) Images to GIF According to the documentation, CRF 23 is default in H.264 and CRF 28 is default in H.265. I’ve included the previous encoder of choice in the table below as well to show how impressive H.265 is. You can check for yourself with two samples I generated: image 1, image 2. One source suggests using CRF 16, but to my eye there is no difference between 17 or 20. I find it extremly hard to judge the result from this. optionally -vf "scale=-1:420, format=gray": rescale (to 420p) and gray-scaleĬRF is a factor to indicate quality/filesize.-preset veryslow: slow encode, best quality.-pix_fmt yuv420p: also necessary for playback in Quicktime.-crf 20: great quality / filesize (28 is default, 16 is visually lossless).-tag:v hvc1: necessary for playback on OSX.-vcodec libx265: the best quality encoder.
Ffmpeg -r 10 -pattern_type glob -i "*.JPG" -vcodec libx265 -tag:v hvc1 -preset veryslow -crf 20 -an -pix_fmt yuv420p result.mp4
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