Only a single program was used to safely compress all textures in MTG.
This was done using optipng with the following settings:
```
optipng -o7 -zm1-9 -nc -strip all -clobber %%f
```
The key command used is -nc, which stops color mode changes. I.e. any RGBA textures will remain RGBA textures, with none being changes to 8-bit indexed mode.
The resulting compression:
| type | size (Bytes) | % of original texture size |
| --- | --- | --- |
| Original | 247,571 | 100% |
| Compressed | 152,189 | 61.5% |
**Summary: Saves 93.14 KB**
A script has been added: utils/optimize_textures.sh which will perform this compression automatically, assuming optipng is installed.
This fixes all cases where the color profile was broken, and
libpng warns about. It also makes almost all textures indexed
instead of RGB where possible (textures that don't have
semi-transparent pixels).
