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[filmscanners] Re: Gamma and Color




>On Wednesday, June 5, 2002, at 11:08  PM, Dana Trout wrote:
> > I have noticed that when I try to change the midtones of an image I am
> > getting noticable color shifts.
> > Does anyone know of a way of adjusting the midtones of a color image
> > *without* affecting the colors?
>
>If you don't want the saturation/hue changes, switch to Lab color mode
>before making changes or creating adjustment layers.

Just to clarify: After doing the mode switch to Lab, when you're creating
the curve in the Curves adjustment layer dialog box, you should have
Lightness selected from the channel pulldown menu. This way your adjustment
only affects the lightness of the image, and not the color information.

If you do this and compare it to similar curve change in the RGB mode, the
results look quite different. For some images, I actually prefer the
oversaturated look that I get when manipulating midtones in the RGB curve.
However, doing these changes in Lab gives me much more control, as I can
create another adjustment layer to fine-tune the color saturation
independent of the midtone lightness.

Sami

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