provide contrast change by color not by pixel
Posted: 2008-12-10T14:18:15-07:00
I found this thread:
viewtopic.php?f=3&t=12272
which is about documentation, but later deal with changes in the contrast-stretch feature.
I would like to post an explicit report about it, however my wish may go in different direction than this expressed in the mentioned report.
The thing is current contrast-stretch is based on pixel count, so even applying the same parameters the effect will be different for different images (I mean, number of blacks/whites). My wish is to provide another CS feature which would be completely independent of pixels, but would only rely on colors.
Example -- user has grayscale image. User would like to shift all pixels which are 30% white as white, and the rest as black (extreme example but I would like to stretch the difference). Now -- it may happen that there are only such pixels which are 30% white, so in effect user would get completely white image. So be it -- but as you see this CS-color feature does not depend on pixel count, but on pixels property -- color only.
Just if anybody is curious, I work with images which are pretty similar in color profile, but vary a lot in whites/blacks count. So each time with current CS I have to change the parameters (actually I gave up, because it is faster to do it in Gimp, than trial&error to get the same results, the same final color profile).
But if I am not mistaken I am not the only one who would like to see this supplementary CS.
viewtopic.php?f=3&t=12272
which is about documentation, but later deal with changes in the contrast-stretch feature.
I would like to post an explicit report about it, however my wish may go in different direction than this expressed in the mentioned report.
The thing is current contrast-stretch is based on pixel count, so even applying the same parameters the effect will be different for different images (I mean, number of blacks/whites). My wish is to provide another CS feature which would be completely independent of pixels, but would only rely on colors.
Example -- user has grayscale image. User would like to shift all pixels which are 30% white as white, and the rest as black (extreme example but I would like to stretch the difference). Now -- it may happen that there are only such pixels which are 30% white, so in effect user would get completely white image. So be it -- but as you see this CS-color feature does not depend on pixel count, but on pixels property -- color only.
Just if anybody is curious, I work with images which are pretty similar in color profile, but vary a lot in whites/blacks count. So each time with current CS I have to change the parameters (actually I gave up, because it is faster to do it in Gimp, than trial&error to get the same results, the same final color profile).
But if I am not mistaken I am not the only one who would like to see this supplementary CS.