User Guide

Corel Painter 265
A gamma curve.
The horizontal axis describes the
input values (original color values).
The vertical axis describes the output
values (corrected values).
Before you adjust a curve, it appears
perfectly diagonal (45 °), which
indicates that all input and output
values are equal.
Corel Painter maps light values at the
top of the graph and darker values at
the bottom.
When editing RGB curves, the
current color is indicated by a colored
point on the curve.
Use the Color Correction dialog to correct
colors.
The Color Correction dialog provides
access to four correction methods that
control how you adjust a gamma
curve:
• Contrast and Brightness
•Curve
• Freehand
•Advanced
You can use a single method or a
combination of methods to adjust the
image.
Correcting Colors Using
Contrast and Brightness
This method lets you adjust the
contrast or brightness of colors, while
maintaining the tonal transitions in
the original image.
You’ll notice that as you adjust the
Contrast or Brightness sliders, the end
points of the curves remain fixed.
That’s because the effect maintains
the levels from the original image.
You’ll always have 256 distinct levels,
regardless of how much you adjust the
sliders.
Contrast adjusts the difference
between light and dark values. As you
increase Contrast, the curve takes on
an “S” shape, indicating that light
colors are becoming lighter and dark
colors darker.
Original Color Values
Cor-
rected
Values
Light
Dark