David writes:

> Moving the image to LAB you can always use the gaussian blur on the B
channel, and a bit on the A. This will reduce color fringing without
affecting sharpness. Then move back to RGB for custom blending <

An alternative to LAB is favoured by many RGB and even more so, CMYK users -
fades or layer blends in COLOR mode (a HS type simulation, similar to how
LAB separates colour from tone). This overcomes many issues with using LAB
for such things as simple sharpening (luminosity blend/fades), or for colour
noise/artifact reduction (color blend/fades).

The LAB approach lets one see the individual colour component channels and
damage while one edits, the B can often have more edits applied than the A
channel.

There are pros/cons for each approach and many viewpoints.


Stephen Marsh.



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