Info:
Color mixer helps you mix colours, change R, G, B or brightness, pick colour
from screen,
copy hex value of current colour to clipboard, it remembers 10 custom colours.
It's easier to mix a colour if you can apply it to a destination picture directly.
This prog does it - it can replace any colour in any window with current colour.
For example, you can pick colour of this background with "pick window"
control and it will be automatically replaced with current colour (green in
this case. If 'auto apply' checkbox is unchecked, nothing would happen).
Requires at least 16-bit colour depth of your display.
Screen shot: