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Image properties filter
--contrast <float> Image contrast (0-2)
Set the image contrast, between 0 and 2. Defaults to 1
--brightness <float> Image brightness (0-2)
Set the image brightness, between 0 and 2. Defaults to 1
--hue <integer> Image hue (0-360)
Set the image hue, between 0 and 360. Defaults to 0
--saturation <float> Image saturation (0-3)
Set the image saturation, between 0 and 3. Defaults to 1
--gamma <float> Image gamma (0-10)
Set the image gamma, between 0.01 and 10. Defaults to 1
--brightness-threshold, --no-brightness-threshold
Enable brightness threshold (default disabled)
Show black and white pixels with brightness as threshold value (default disabled)
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string[] Voption ={ ":contrast=0" };
P.S. Sorry for my bad english.