Hi reyalp,
"I read that as saying *if* the percent of overexposed pixels exceeds "OverExposure Threshold", *then* the exposure is reduced by the value set in "Overexp Compensation"
Yes, that would seem to be the case.
"It can only be the whole image, there is no capability in CHDK to change exposure only for parts of the image."
Right OK. I was thinking that maybe in the 'evaluative' setting CHDK was somehow able to affect changes in the over-exposed areas of the image.
I've tried the extremes of the 'overexposure threshold', and 'overexposed pixel percentage' settings and do not see any difference?
If what you say is true, it would seem that finding the best Zebra settings, in conjunction with manipulating exposure compensation, would achieve the same results as using the custom auto iso over exposure?
...... john
