This script "dithers" RGB images to 16-bit color, either:
ARGB4444/4096colors+16levels of transparency,
RGB565/65536colors+ no transparency, or
ARGB1555/32768colors + fully transparent or not.
The higher-depth dither is especially useful for mobile developers who need to pre-dither
assets for 12-bit screens.
Version 0.2 - Added RGB565 and ARGB1555.
Please email me for any issues... I'm pretty swamped, but I'll try to address!