manongjohn 5d1508
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\begin{document}
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\thispagestyle{empty}
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\Large
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\noindent \\
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Fog Ino\medskip
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\par
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\normalsize
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It scatters light.\par
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Allows for the creation of light scattering effects in water, bath, fog, etc.,\par
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It aims at creating effects like fog and diffusion in optical filters, but it does\par 
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not actually simulate light.\\
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\par
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Each pixel, is affected by the shining of brighter nearby pixels.\par
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Effect from closer pixels will be stronger, while it will have a weaker impact from\par 
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distant pixels.\\
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\par
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When \textquotedbl Alpha Rendering\textquotedbl \ is active, Alpha channel will be processed first,\par
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then it will process all RGB pixels where the Alpha channel is not zero.\\
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\par
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When \textquotedbl Alpha Rendering\textquotedbl \ is inactive, Alpha channel will not be taken into account,\par
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so the RGB image changes will not be masked, causing jagged edges.\\
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\\
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-{-}- \ Inputs \ -{-}-\\
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Source\par
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Connect the image to be processed.\\
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\\
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-{-}- \ Settings \ -{-}-\\
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Radius\par
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The extent to which scatter light, specified as a circle radius.\par
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The unit is millimeters.\par
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Specify a value greater than or equal to 0. The maximum is 100.\par
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When the value is smaller than a pixel, no light will be scattered and fog will not\par 
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be applied.\par
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The larger the Radius, the longer it will take to process.\par
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The default value is 1.\\
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\\
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Curve\par
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The attenuation curve of scattered light.\par
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Specify a value greater than 0.01. The maximum is 100.\par
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The effect will be weaker on farther pixels,\par
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the change is represented by a Gamma curve.\par
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When the value is 1.0 brightness will be linearly attenuated.\par
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The smaller the value, the narrower the brightness becomes (the effects is reduced\par 
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more abruptly),\par
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The larger the value, the broader the brightness becomes (the effect is emphasized).\par
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The default value is 1.
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\ \vspace{-0.2em}
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\par
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\noindent Power\par
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Changes the intesity of the light.\par
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Specify a value in the range 0 to 1.\par
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It is possible to specify values above 1.0, up to a maximum 2.0, to emphasize the\par 
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light.\par
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Such an emphasis may prove useful to emit light from dark portions such as ink\par 
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lines.\par
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When the value is 0.0 light will not be scattered, and fog will not be applied.\par
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It is possible to specify negative values, down to a minimum of -2.0.\par
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In such a case there will be no light scattering, but darkness scattering.\par
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The default value is 1.\\
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\\
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Threshold Min\\
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Threshold Max\par
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Pixels with this luminosity value or higher will emit light.\\
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\par
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In additionn to being affected by the brightness from brighter neraby pixels,\par
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pixels with values higher than (\textquotedbl Threshold Min\textquotedbl ) will emit light themselves.\par
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The brightness, will be determined by the L value (of HLS) of the pixels.\\
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\par
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Values specified can range from 0.0 to 1.01.\\
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\par
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If both values are set to 1.01, fog will not be applied.\\
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\par
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When \textquotedbl Threshold Max\textquotedbl \ is greater than \textquotedbl Threshold Min\textquotedbl ,\par
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the fog intensity will change linearly from Min and Max.\\
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\par
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By setting \textquotedbl Threshold Max\textquotedbl \ to zero (and less than Min),\par
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light will be emitted from pixels with a brightness of \textquotedbl Threshold Min\textquotedbl \ or more.\par
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Setting \textquotedbl Threshold Min\textquotedbl \ to 0 will produce a full fog.\\
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\par
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The default value is 0 for both parameters.\\
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\\
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Alpha Rendering\par
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This option is valid only when there is an Alpha channel.\par
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When inactive, it masks the changes in the RGB values using the original Alpha\par 
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of the image.\par
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When active, the effect will be able to modify the Alpha channel, extending it\par 
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as necessary to reproduce the full span of the effect.\par
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The default setting is inactive.
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