Autor Tema: Lossy gif compressor  (Leído 1626 veces)

Fl0ppy

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Lossy gif compressor
« en: 19 de Noviembre de 2016, 07:48:19 pm »
Te optimiza los gif animados, ejemplo de comandos bajo windows:

Código: [Seleccionar]
gifsicle.exe -i image.gif −−optimize -O3 >new.gif
https://kornel.ski/lossygif
Quote (selected)
This is an encoder (based on gifsicle) which implements lossy LZW compression. It can reduce animgif file sizes by 30%—50% at a cost of some dithering/noise.

Downloads and source code on GitHub

Usage
./gifsicle -O3 --lossy=80 -o lossy-compressed.gif input.gif
Adjust --lossy argument to quality you want (30 is very light compression, 200 is heavy).

It works best when only little loss is introduced, and due to limitation of the compression algorithm very high loss levels won't give as much gain.

How does it workGIF's LZW compression is based on a "dictionary" of strings of pixels seen. Normal encoder searches the dictionary for the longest string of pixels that exactly matches pixels in the image. Lossy encoder picks longest string of pixels that's "similar enough" to pixels in the image (plus some magic to hide the distortions with dithering).

Examples 3.3MB original vs 1.2MB lossy recompression My version (191KB) Photoshop (201KB) Original (438KB) Source: Fire breathing "Jaipur Maharaja Brass Band" Chassepierre Belgium by Luc Viatour

For static GIFs don't bother with this encoder and use lossy optimized PNG instead.
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