Operation Manual

528 | Corel DESIGNER X7 User Guide
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1. Rotation tools 5. Select white point 9. Sliders
2. Pan tool 6. Select black point 10. Hint for current tool
3. Zoom tools 7. Undo, Redo, and Reset 11. Histogram
4. Preview Modes 8. Snapshots 
The Image Adjustment Lab consists of automatic and manual controls, which are organized in a logical order for image correction. By
starting in the upper-right corner and working your way down, you can select only the controls you need to correct the problems specific to
your image. It is best to crop or retouch any areas of the image before beginning the color and tone corrections.
When you work in the Image Adjustment Lab, you can take advantage of the following features:
• Create snapshot — You can capture the corrected version of an image in a “snapshot” at any time. Thumbnails of the snapshots appear
in a window below the image. Snapshots make it easy to compare different corrected versions of the image so you can choose the best
one.
• Undo, Redo, and Reset to original — Image correction can be a trial-and-error process, so the ability to undo and redo corrections is
important. The Reset to original command lets you clear all corrections so that you can start again.
Using automatic controls
You can begin by using the automatic correction controls:
• Auto adjust — automatically corrects the contrast and color in an image by detecting the lightest and darkest areas and adjusting the
tonal range for each color channel. In some cases, this control may be all you need to improve an image. In other cases, you can undo
the changes and proceed with more precise controls.
• Select white point tool — automatically adjusts the contrast in an image according to the white point that you set. For example, you
can brighten an image that is too dark by using the Select white point tool.
• Select black point tool — automatically adjusts the contrast in an image according to the black point that you set. For example, you can
darken an image that is too light by using the Select black point tool.
Using color correction controls
After using the automatic controls, you can correct color casts in your image. Color casts are typically caused by the lighting conditions when
a photo is taken, and they can be influenced by the processor in your digital camera or scanner.
• Temperature slider — lets you correct color casts by “warming” or “cooling” the color in an image to compensate for the lighting
conditions at the time the photo was taken. For example, to correct a yellow color cast caused by taking a photo indoors in dim
incandescent lighting, you can move the slider toward the blue end to increase the temperature values (based on degrees Kelvin). Lower
values correspond to low lighting conditions, such as candlelight or light from an incandescent light bulb; these conditions cause an
orange cast. Higher values correspond to intense lighting conditions, such as sunlight; these conditions cause a blue cast.
• Tint slider — lets you correct color casts by adjusting the green or magenta in an image. You can add green by moving the slider to the
right; you can add magenta by moving the slider to the left. Moving the Tint slider after using the Temperature slider lets you fine-tune
an image.
• Saturation slider — lets you adjust the vividness of colors. For example, by moving the slider to the right, you can increase the vividness
of a blue sky in an image. By moving the slider to the left, you can reduce the vividness of colors. You can create a black-and-white photo
effect by moving the slider all the way to the left, so that all color in the image is removed.