258 Corel Painter X3 Getting Started Guide
To adjust colors by specifying curve values
1 Choose Effects Tonal Control Correct Colors.
2 In the Color Correction dialog box, choose Advanced from the list box.
3 Type percentage values for Red, Green, or Blue in the following columns:
• Highlight — adjusts the image highlights (lower portion of the graph)
• 1/4 Tone — adjusts the image contrast
• Midtone — adjusts the image contrast
• 3/4 Tone — adjusts the image contrast
• Shadow — adjusts the image shadows (upper portion of the graph)
Typing positive percentages, such as 89%, sets values in the upper portion of the
graph, which lightens the image. Typing negative percentages, such as -89%, sets
values in the lower portion of the graph and darkens the image. Typing the same
percentage value for each color applies the change equally.
Adjusting hue, saturation, and value
The Adjust Colors effect lets you control the hue, saturation, and value of an image in
much the same way as you would adjust your television. It also lets you adjust the image
colors equally or by using the luminosity of an external source.
When using luminosity to adjust colors, pixels with higher luminance undergo greater
color adjustments.
You can choose any of the following adjustment methods:
• Uniform Color — adjusts all pixels equally
• Paper — uses the selected paper grain to control the color adjustment
• Image Luminance — uses the luminance of the image as the model for color
adjustment. Areas of greater luminance are adjusted more.
• Original Luminance — uses the luminance of the clone source as the model for
color adjustment. If you have not set up a clone source, the current pattern is used.
• [Alpha channel] or [Layer mask] — sets the selected alpha channel or layer mask
as the model for controlling color adjustment. For example, a black-to-white
gradation in the channel or mask lets you adjust the color progressively across the
image. In black areas of the channel or mask, colors are not changed. In white areas
of the channel or mask, the adjustment applies fully. Transitional areas receive
proportional color adjustments.
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