ImageAttributes.ClearNoOp Method (ColorAdjustType)
Clears the NoOp setting 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.
You can disable color adjustment for a certain category by calling the SetNoOp method. Later, you can reinstate color adjustment for that category by calling the ClearNoOp method. The color adjustment then returns to what was in place before the call to SetNoOp.