Operation Manual

530 | Corel DESIGNER X7 User Guide
The histogram plots the brightness values of the pixels in an image on a scale of 0 (dark) to 255 (light). The left part of the histogram
represents the shadows, the middle part represents the midtones, and the right part represents the highlights. The height of the spikes
indicates how many pixels are at each brightness level. For example, a higher number of pixels on the left side of the histogram indicates the
presence of image detail in the dark areas of the image.
The photo on the left is underexposed. Right: The histogram indicates
a large amount of image detail in the dark areas of the photo.
Viewing images in the Image Adjustment Lab
The tools in the Image Adjustment Lab let you view images in various ways, so that you can evaluate the color and tone adjustments you
make. For example, you can rotate images, pan to a new area, zoom in or out, and choose how to display the corrected image in the
preview window.
Using other adjustment filters
Although the Image Adjustment Lab lets you correct the color and tone of most images, a specialized adjustment filter is sometimes
required. Using the powerful adjustment filters in the application, you can make precise adjustments to images. For example, you can adjust
images by using a tone curve. For more information about adjustment filters, see “Adjusting color and tone” on page 532.
To correct color and tone in the Image Adjustment Lab
1
Click Bitmaps Image Adjustment Lab.
2 Click Auto adjust.
Auto adjust automatically adjusts color and contrast by setting the white point and black point for an image.
If you want to control the white point and black point setting more precisely, click the Select white point tool , and click the lightest
area of your image. Then click the Select black point tool , and click the darkest area of your image.
3 Perform one or more tasks from the following table.
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To Do the following
Correct color in the image Adjust the Temperature slider to warm or cool the colors, and then
fine-tune the color correction by adjusting the Tint slider.
Make colors more vivid or less vivid Move the Saturation slider to the right to increase the amount
of color in the image; move the slider to the left to decrease the
amount of color in the image.
Brighten or darken an image Move the Brightness slider to the right to lighten the image; move
the slider to the left to darken the image.
Improve image sharpness by adjusting tone Move the Contrast slider to the right to make the light areas lighter
and the dark areas darker.