Wide
Source (foreground):
color wheel
contrast
Destination (background):
color wheel
contrast
Blend equation:
color wheel
contrast
Resulting equations:
Red:
Green:
Blue:
Alpha:

Foreground:
example image example image example image example image example image example image example image example image example image example image example image example image example image
Background:
example image example image example image example image example image example image example image example image example image example image example image example image example image
Foreground: Background:

Source Code

XML
VRML

See Also