ImageAttributes.ClearGamma Method (ColorAdjustType)
Disables gamma correction for a specified category.
Assembly: System.Drawing (in System.Drawing.dll)
An ImageAttributes object maintains color and grayscale settings for five adjustment categories: default, bitmap, brush, pen, and text. For example, you can specify a gamma value for the default category, a different gamma value for the bitmap category, and still a different gamma value for the pen category.
The default color-adjustment and grayscale-adjustment settings apply to all categories that do not have adjustment settings of their own. For example, if you never specify any adjustment settings for the pen category, then the default settings apply to the pen category.
As soon as you specify a color-adjustment or grayscale-adjustment setting for a certain category, the default adjustment settings no longer apply to that category. For example, suppose you specify a gamma value and a color-adjustment matrix for the default category. If you set the gamma value for the pen category by calling the SetGamma method, the default gamma value will not apply to pens. If you later clear the pen gamma value by calling the ClearGamma method, the pen category will not revert to the default gamma value; rather, the pen category will have no gamma value. Similarly, the pen category will not revert to the default color-adjustment matrix; rather, the pen category will have no color-adjustment matrix.