Color correction doesn't work

[Jarkod]

Another thing that Corel's spoilt. When I want to make a colour more (or less) intensive, I have to move a slider way far to the right (or left). Small movements don't change anything. What's more, what changes is NOT the colour I chose! In the picture below I wanted to make the cyclist and the bike colour more vivid and a bit lighter. I picked a colour frome the place a bit above from the middle of the big weel (a kind of brown), and moved the Saturation slider to the right. To my supprise the change was minute. But what changed also was the colour of the wall and grass. When I wanted to change the Luminance and moved the slider to the right, only the luminance of grass changed. Even hue changes not the way it should. The most spectacular (mis)behaviour was when I changed Saturation +100 and range +120: grass became oversaturated but the wheel changed only slightly.

[Jarkod]

Two more files that show the strange behaviour of the Colour Correction. First shows how the color of grass chanhes when I move a slider to the right, the second - that Saturation is in fact applied to the wrong colour. I don't know what to expect in such a situation, but to my mind the whole picture colour should change somehow.

[nyukuri]

I too have problems with color correction:
the saturation slider hardly changes anything and with luminance I don't realize any change at all!!! to me it seems that the luminance slider is not functioning at all!

I suggest you use the plugin "Color Equalizer" from http://www.kbarni.net instead. It works much better, though it lacks the "range" functionality

[RickHeath]

I've been experimenting with some photos of a Ugandan children's choir - lots of brown skin tones & primary coloured clothing. I can easily desaturate/oversaturate the brighter colours but browns do seem problematic.

Part of the problem is with the initial image (& the skin tones in the images I've been looking at) is that browns have low saturation levels in all channels anyway (R68 G46 B34 L51 seemed to be about typical for skin tones here going to around R151 G136 B143 L141 in the highlights). The effect on more muted colours will always be much less marked than brighter shades.

Where colour changes cause problems to other parts of an image you can always use regions on a layer to easily isolate the effect to specific parts.

Regards

Rick.