Stroker, maybe that's the answer....
csjwolfe, welcome to RetouchPRO
Without seeing the image(s) that you are manipulating, here goes a hunch.
It could be that although the image may
look pretty smooth, in fact the colours are quite noisy.
(Without separating the colours from the Luminosity [greyscale] information it is very difficult for our eyes too "see" detailed colour information)
What we could do then is to blur the colours a little while leaving the luminosity untouched....
Try this
...(on a new copy of the image)
- Duplicate the layer (<
Ctrl><
J>);
- Set the blending of the new layer to Color
- nothing has happened yet;
- Blur this new layer slightly
(increase the radius until you perceive the blurring, then back off a little);
- Merge the two layers back together (<
Ctrl><
E>)
Now try the colour replacement.
Rô