Pherdinand
the snow must go on
markho, i think you got it slightly wrong.
You can adjust each colour individually relative to each other in a blink of an eye.
Try this e.g.: Take a nice colourful image. Load it in Photoshop. Go to adjustments hue/saturation. Select e.g. "blues" instead of rgb. Move the "hues " slider by a low amount of say, three. Do you see a relative change?
Other way: Bring up "lkevels" and do an "auto levels" on a freshly scanned image in the RGB mode. Then go selec the "red" and look at the histogram. Select the "green" channel and look at the histogram. Same with "blue". All three histograms will be adjusted differently - just by pressing one single button, the "auto levels".
Same happens with "auto curves", "auto contrast". And these are the basic functions that every scanner or image manipulation software has, and almost everybody uses for each frame separately when or after scanning.
You can adjust each colour individually relative to each other in a blink of an eye.
Try this e.g.: Take a nice colourful image. Load it in Photoshop. Go to adjustments hue/saturation. Select e.g. "blues" instead of rgb. Move the "hues " slider by a low amount of say, three. Do you see a relative change?
Other way: Bring up "lkevels" and do an "auto levels" on a freshly scanned image in the RGB mode. Then go selec the "red" and look at the histogram. Select the "green" channel and look at the histogram. Same with "blue". All three histograms will be adjusted differently - just by pressing one single button, the "auto levels".
Same happens with "auto curves", "auto contrast". And these are the basic functions that every scanner or image manipulation software has, and almost everybody uses for each frame separately when or after scanning.