![Hans-Christoph Steiner](/assets/img/avatar_default.png)
zopfli is a compression algorithm that optimizes the standard ZIP DEFLATE compression. All of this is visually lossless, except for two minor things: * lossy_transparent: remove colors behind alpha channel 0. No visual difference, removes hidden information. * lossy_8bit: convert 16-bit per channel image to 8-bit per channel. This was done using the 'zopfli' package in Debian/buster, invoking this way: zopflipng --iterations=50 --filters=01234mepb --lossy_8bit --lossy_transparent -y $f ${f}.zopfli.png
11 KiB
1024x500px
11 KiB
1024x500px
![](/missytake/fdroiddata/raw/commit/a5c08f171e97a46698baf0cfae7cfbbf5b28cec5/metadata/org.telegram.messenger/en-US/featureGraphic.png)