Function Mask ( Color As Integer ) As Image

Multiply each color component of each pixel by the color component of the specified color.

For example, if the red component of Color is 0, the red value of all pixels will be cleared; if the red component of Color is 255, then the red value of all pixels will be unchanged; if the red component is between 0 and 255, the red value of all pixels will be reduced proportionally.

In other words:

Pixel component = Pixel component * Color component / 255

The same process occurs for the blue, green and alpha component.