Black and White:
To change your image into black and white. Click on Image > Colors > Black and White and your image becomes black and white.
You can always undo changes by clicking  or Edit > Undo. To redo click  or Edit > Redo.
Gray Scale:
To change your image into grey scale. Click on Image > Colors > Grey Scale and your image becomes Grey Scale.
Aagin, you can always undo changes by clicking or Edit > Undo. To redo click or Edit > Redo.
Set Gamma:
To set Gamma corrections to your image. Click on Image > Colors > Set Gamma and the following window appears.
Here you can set Gamma correction with the Red, Green and Blue sliders. To have separate control over each individual color uncheck Link sliders box. When you have your desired settings click OK.
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