Colour Correction - Curves and Adjustment Layers

Page 3

RIGHT:

1. The values are greyed out at A because no control points have been set on the curve. At B the Info Palette shows the values of the target swatch, the light skin tone.

2. The a curve control point has been moved from 20 to 14 in the direction indicated by the arrow, shown at C.

3. The control point pinned at E is the colour biased one, which should, in reality, be at the position shown at F in #4.

5. The aim value of the control point can be moved to an identical position by shifting the base of the curve along (as at H). This will affect the other tones in a different way and if the nature of the colour bias is described by such a straight line then this will be a more effective curve move. You have to check other colours to determine this.

6. The greatest risk when curve driving is if a tone at the ends of the curve (top or bottom) is moved and drags the other parts of the curve in a disproportionate way. Again, you have to look at your curve and other colours to determine the best way to get around this.

STOP PRESS

Things never stay still for long. Since this piece was written Photoshop CS3 has appeared, complete with even more sophisticated curve controls, which are also linked to the histogram display. The basics of what we say above remains true, the implemenation has been made easier.

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