Please help me to understand "Channel Mixer"

[obe (Olaf Berthelsen)]

Hi’ @MStraeten
Thank you for your answer. It makes good sense.

I used the color zones module to get close to the blue color I wanted and used the channel mixer wth a mask to do the last fine tuning.

I have tried to read the thread Please help me to understand "Channel Mixer" - #4 by patdavid several times and noted the following:

@james

Any slider in the Red channel can only affect the R value of your output pixel. Likewise, any slider in the Green channel can only affect the G value of the output pixel, and any slider in the Blue channel can only affect the B value of the output pixel.

…………but adjusting the blue slider in the red channel from 0 to 2 makes changes the G-value from 87 to 78? And the B-value changes as well. See screen shots below. This is not according to the theory?