How to work with Grey Scale
To work with Grey Scale
Select the Choose Color tab from the Menu Bar and choose Grey Scale.
The Grayscale command removes the colors from an image and replaces each color with a gray matching its luminance value. The effect is similar to a black-and-white photograph.
To convert an image to grayscale:
Choose Colors and Grayscale, or
Click the optional Grayscale button on the toolbar.