Change the background (or mask) color of an image.
The Change color window
shows 2 images.
The top image is the original and the bottom image shows
a preview of any color changes made.
Click anywhere in the top image to select
the color to change.
A default color of BLACK is used as a replacement color.
You can change this by clicking the color box adjacent to
'Replacement color'.
Click Apply to accept the changes or close the window via [X] to ignore.