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\Large

\noindent \\

Fog Ino\medskip

\par

\normalsize

It scatters light.\par

Allows for the creation of light scattering effects in water, bath, fog, etc.,\par

It aims at creating effects like fog and diffusion in optical filters, but it does\par 

not actually simulate light.\\

\par

Each pixel, is affected by the shining of brighter nearby pixels.\par

Effect from closer pixels will be stronger, while it will have a weaker impact from\par 

distant pixels.\\

\par

When \textquotedbl Alpha Rendering\textquotedbl \ is active, Alpha channel will be processed first,\par

then it will process all RGB pixels where the Alpha channel is not zero.\\

\par

When \textquotedbl Alpha Rendering\textquotedbl \ is inactive, Alpha channel will not be taken into account,\par

so the RGB image changes will not be masked, causing jagged edges.\\

\\

-{-}- \ Inputs \ -{-}-\\

Source\par

Connect the image to be processed.\\

\\

-{-}- \ Settings \ -{-}-\\

Radius\par

The extent to which scatter light, specified as a circle radius.\par

The unit is millimeters.\par

Specify a value greater than or equal to 0. The maximum is 100.\par

When the value is smaller than a pixel, no light will be scattered and fog will not\par 

be applied.\par

The larger the Radius, the longer it will take to process.\par

The default value is 1.\\

\\

Curve\par

The attenuation curve of scattered light.\par

Specify a value greater than 0.01. The maximum is 100.\par

The effect will be weaker on farther pixels,\par

the change is represented by a Gamma curve.\par

When the value is 1.0 brightness will be linearly attenuated.\par

The smaller the value, the narrower the brightness becomes (the effects is reduced\par 

more abruptly),\par

The larger the value, the broader the brightness becomes (the effect is emphasized).\par

The default value is 1.

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\par

\noindent Power\par

Changes the intesity of the light.\par

Specify a value in the range 0 to 1.\par

It is possible to specify values above 1.0, up to a maximum 2.0, to emphasize the\par 

light.\par

Such an emphasis may prove useful to emit light from dark portions such as ink\par 

lines.\par

When the value is 0.0 light will not be scattered, and fog will not be applied.\par

It is possible to specify negative values, down to a minimum of -2.0.\par

In such a case there will be no light scattering, but darkness scattering.\par

The default value is 1.\\

\\

Threshold Min\\

Threshold Max\par

Pixels with this luminosity value or higher will emit light.\\

\par

In additionn to being affected by the brightness from brighter neraby pixels,\par

pixels with values higher than (\textquotedbl Threshold Min\textquotedbl ) will emit light themselves.\par

The brightness, will be determined by the L value (of HLS) of the pixels.\\

\par

Values specified can range from 0.0 to 1.01.\\

\par

If both values are set to 1.01, fog will not be applied.\\

\par

When \textquotedbl Threshold Max\textquotedbl \ is greater than \textquotedbl Threshold Min\textquotedbl ,\par

the fog intensity will change linearly from Min and Max.\\

\par

By setting \textquotedbl Threshold Max\textquotedbl \ to zero (and less than Min),\par

light will be emitted from pixels with a brightness of \textquotedbl Threshold Min\textquotedbl \ or more.\par

Setting \textquotedbl Threshold Min\textquotedbl \ to 0 will produce a full fog.\\

\par

The default value is 0 for both parameters.\\

\\

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 inactive.

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