Corel PaintShop Pro X7, DE User's Guide download pdf (Page 197)

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Adjusting images 193

2In the Edit group box, choose one of the following options:

• Luminance — lets you set the lightness values of the image to

correct contrast

• Colors — lets you choose a color channel to edit

If you choose the Colors option, you must choose a color from the

drop-list.

3In the Load Preset drop-list, choose Default.

The default values represent no adjustment to the image.

4 Adjust the Low slider.

On the left side of the histogram, look for a gap between the left

edge and the point where the graph starts to rise. A gap shows

that the darkest pixels in the image are not completely black. Drag

the Low slider (the black triangle) to the point where the graph

rises. The Low control displays the low position (from 0 to 254).

The bottom control displays the percentage of pixels that are

between zero and the low value; contrast for these pixels will be

lost. As a general rule, keep the Low value lower than 0.1%.

5 Adjust the High slider.

On the right side of the histogram, look for a gap between the

right edge of the window and the point where the graph

decreases to zero pixels. If there is a gap, drag the High slider (the

white triangle) to that point on the graph. This action changes the

lightest pixels in the image to white. As a general rule, keep the

High value lower than 0.1%.

6 Adjust the Gamma slider.

If the overall image is too dark or too light, adjust the gamma,

which is a standard measure of change in an image’s contrast. To

lighten the image, increase the gamma by dragging the Gamma

slider (the gray triangle) to the right. To darken the image,

decrease the gamma by dragging the Gamma slider to the left.

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Corel PaintShop Pro X7, DE User's Guide Page 197

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