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user:jenda:contrast [2015/01/22 14:17]
jenda created
user:jenda:contrast [2017/05/25 01:54] (current)
jenda it is broken in recent X.org
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 Use-case: Enhance contrast when reading scanned document and document viewer does not support contrast adjustment. Use-case: Enhance contrast when reading scanned document and document viewer does not support contrast adjustment.
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 +<note warning>​XF86VidModeSetGammaRamp [[https://​bugs.freedesktop.org/​show_bug.cgi?​id=27222#​c27|is broken]] in recent X.org. I have created an [[https://​jenda.hrach.eu/​f/​xlevels/​redshift.d51c25e76eaf9d7f9318f5ec1b4e7eb04454f46c.patch|ugly patch]] for redshift (apply, compile, run "​./​src/​redshift -O 3000 white_threshold black_treshold"​) to work around it.</​note>​
  
 I was unable to find a tool that can fix this (tried xcalib, xgamma, xrandr and redshift). So I have created one myself. Unfortunately I don't know how to set contrast per window, so your whole X session is affected. I was unable to find a tool that can fix this (tried xcalib, xgamma, xrandr and redshift). So I have created one myself. Unfortunately I don't know how to set contrast per window, so your whole X session is affected.
 
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