Quote:
Originally Posted by Somnium
is there value in doing a lum layer then ?
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As Colin and Andy mentioned, there are advantages in processing lum and colour separately and combining them late in the workflow. Here's just a couple of reasons why:
- some operations you'll want to perform on lum, like various types of sharpening, will have a bad effect on the colour component (enhancing the chrominance noise)
- operations which modify RGB colour can also affect overall brightness and vice versa. Keeping lum separate prevents this "contamination"
There are ways to get around these issues, like working in CIE L*a*b* colour space, but I generally find it easier to just keep lum and colour separate.
Cheers,
Rick.