Changing the Contrast
Depending on your data values and the color table chosen, you may want to adjust the contrast of your image for a better view. Contrast refers to the range of available colors in the color table centered around the brightness setting. The contrast value represents a percentage of the color table (0 to 100%), not a specific range of color indices in the color table.
 
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The brightness and contrast controls are related; brightness defines a relative center point in the color table around which the contrast range is centered.
The contrast is controlled by a slider in the controls area of the Image Tool window. The contrast control can be adjusted any of these three ways.
*Click and drag MB1 on the contrast slider.
*Position the pointer in the contrast slider track and click MB1. The slider is adjusted by 10% of the maximum slider value for each MB1 click.
*Double click MB1 in the contrast slider text field and type in the desired contrast value. Press <Return> to apply the new value.
 
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Brightness and contrast adjustments work best with a ramped color table. The color table can be ramped using the Color Tool or by selecting Image=>Convert To=>Color=>Linear Grayscale.
See Also