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 Contrast of the icon:

• Choose Effects > Adjust Contrast.

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

The Lock Check provides the uniform regulation

Example: