Corel Painter X3 Win/Mac, EDU, EN User's Guide Page 274

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Correcting and adjusting colors 251
You can use a single curve method, or a combination of curve methods, to adjust the
image.
You can apply color correction to a selection, a layer, or the entire image.
If there is no selection, the correction is applied to the entire image.
To correct the color of only a section of the canvas, select the area by using a
selection tool before applying the color correction. For more information about
these tools, refer to “Getting started with selections” on page 544.
To correct the color of a layer, select the layer before applying the color correction.
For more information about selecting a layer, refer to “Selecting layers” on
page 489.
To apply color correction to a shape, dynamic layer, text layer, or reference layer,
you must first commit the layer to an image layer.
Adjusting brightness and contrast
Corel Painter offers two different methods for adjusting image brightness and contrast.
You can adjust brightness and contrast more quickly by using the Brightness/Contrast
effect, or more precisely by using the curve in the Color Correction dialog box.
When using the Brightness/Contrast effect, you can adjust all image colors at once.
Before (left) and after (right) applying the Brightness/Contrast effect.
When using the curve, you can adjust the contrast or brightness of colors while
maintaining the tonal transitions in the original image. You can adjust all colors at once,
or adjust R, G, and B individually. As you adjust the Contrast or Brightness sliders,
the endpoints of the curves remain fixed. Because the effect maintains the levels from
the original image, there are always 256 distinct levels, regardless of how much you
adjust the sliders.
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