Implementing LCD AA over transparent background

Belleve Invis
Belleve Invis Posts: 269
edited October 2016 in Technique and Theory
Given that subpixel R, G and B have different coverage, it requires six-channels to represent the full blending mechanism (RGB, and three corresponding alphas). However, can the three alpha channels be compressed into one channel, so that the three alphas can be fitted in 8 bits?