I don’t know why, but the current version of pcsx-rearmed is dithering every texture on all games.
Intentional or not, I don’t like it, so here’s a small guide to disable dithering all along.
Note that doing this will disable dithering on titles like Silent Hill where dithering is actually used.
Step 1) Get the pcsx source. git clone git://github.com/libretro/pcsx_rearmed.git pcsx_rearmed
Step 2) Edit the source.
Enter the pcsx_rearmed/ folder created by git and edit plugins/gpu_neon/psx_gpu/psx_gpu.h
Localise this code section (line 50 in the version I’m using)