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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\\

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-{-}- \ 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.\\

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-{-}- \ 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.\\

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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.\\

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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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