The following animation can be user as a template to remind you what each colour dot on gen_ex.bmp changes.
Each frame represents each dot (you can spew out each frame as a reference for each dot). So, the first frame depicts what colour is affected by the first pixel colour dot, the second frame the second dot etc etc
The area highlighted in
RED is what affected by that colour, each frame is also numbered, these numbers match up to what pixel is changed.
Mad props and shouts to
macaroon for this great tool.