RGB model

A large percentage of the visible spectrum can be represented by mixing red, green,
and blue (RGB) light in various proportions and intensities. These three colors are
called the additive primaries. Added together, red, green, and blue light make white light.
Where two colors overlap, they create cyan, magenta, or yellow.

The Adjust Contrast command lets you regulate Contrast of your icon.

To Adjust Brightness of the icon:

• Choose Effects > Adjust Brightness.

Using the corresponding scrolling in this dialogue allows you regulate the icon Contrast.

The Lock Check provides the uniform regulation.