I am using FFMPEG on macOS Mojave, ffmpeg version is 4.1.1. I am not sure what is it that I am doing wrong and how can I fix this banding/ trailing effect. Sample output of the file is here Output here I am not sure the best way to describe it, but lets say the output GIF has huge 'banding/ trailing' effect ( not desired ). This is the command I am using to resize the GIF ffmpeg -i default.gif -filter_complex ' scale=320:-1:flags=lanczos,split palettegen=reserve_transparent=on:transparency_color=ffffff paletteuse' resize.gif If you're aiming to minimize MSE, then that's not too expensive and it's similar to gradient descent.I am trying to resize a transparent gif using ffmpeg. Adjust weights/counts in histogram from quality feedback measured from remapped image.This shifts axis-aligned subdivisions to local optimum (I've tried applying that after every subdivision, but it didn't matter - once in postprocessing is enough!) Voronoi iteration after generating palette (like a final step in LBG quantization).

The biggest wins I've found (and implemented in libimagequant) were: However, Wu's method needs lookup tables for the whole color (hyper)cube, which requires either large (or for RGBA still ridiculous) amount of RAM or reduced precision, and losing bits of input is way worse than having suboptimal division. Wu's method is nice in this case because it exactly measures variance of sets after a split, while median cut just estimates. I've tested median cut that can cut at various angles and variants that cut out spheres, and it didn't make much difference.Ĭhoice of the box to cut and the location where you cut is more important. Aligned subdivisions are not that much of a problem actually.

Ffmpeg gif transparency