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\Large
\noindent \\
Subtract Ino\medskip
\par
\normalsize
Performs a subtraction between two images.\par
Images will become darker using subtraction.\par
Formula = Back - Fore\\
\\
-{-}- \ Inputs \ -{-}-\par
When both input ports are connected, they will be combined in the process.\par
When the node Visibility switch is OFF it will display the Back port content.\par
If there is only one port connected, it will display its content.\\
Fore\par
Connect the image that will be overlayed on top.\\
Back\par
Connect the base image.\\
\\
-{-}- \ Settings \ -{-}-\\
Opacity\par
Specifies the opacity of the image overlaid on top.\par
When 0 the Fore image will be transparent.\par
With the default value \textquotedbl 1.0\textquotedbl \ , the Fore image will be composed as opaque.\par
Specify a value from 0 to 1.0.\\
\\
Clipping Mask\par
When ON, it will take the Back port alpha information to define the alpha of the\par
resulting image, leaving areas where the Alpha value is zero as transparent.\par
The default value is ON.\\
\\
Alpha Rendering\par
This option is valid only when there is an Alpha channel.\par
When inactive, it masks the changes in the RGB values using the original Alpha\par 
of the image.\par
When active, the effect will be able to modify the Alpha channel, extending it\par 
as necessary to reproduce the full span of the effect.\par
The default setting is ON.\\

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