There are several additional  functions for color adjustment of the image. All these functions are available through the "Image" menu item:

•Negative. Invert the color values of the image.

•Gray-scale.

•Convert to Black & white image.

•Convert to True colors.

•Reduce the number of colors.

•Swap colors. A sub-menu allows you to select one of the color combinations to change the image. This command operates at the pixel level, changing the color of all, or most, depending on which combination you select.

•Replace color. You can replace all pixels on image from the source color to desired color.  Tolerance value is used in most cases ( 0 - 100 range).