Bugs item #1801391, was opened at 2007-09-24 19:56
Message generated for change (Comment added) made by dooglus
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Private: No
Submitted By: Genete (genete)
Assigned to: Nobody/Anonymous (nobody)
Summary: Color dialog and RGB composite values don't show same values

Initial Comment:
The color dialog shows three sliders from 0 to 100. If I convert a Color 
parameter into its RGB components (composite) they don't show the same values. 
For example RGB = 0.5, 0.5, 0.5 in  the color dialog then the composite RGB 
values gives RGB = 0.217638, 0.217638, 0.217638.

Also the HTML code (I guess hexadecimal value for RGBA in a 00 -- FF range) 
correspond to the RGB values for the composited ones and not for the decimal 
numerical values of the color dialog.

Reading about RGB in Wikipedia I see that there is a non linear correspondence 
between the diplayed color by the computer and the RGB values then there is a 
non linearity due to gamma correction. See:
http://en.wikipedia.org/wiki/RGB_color_model#Nonlinearity

But if it is in that way, it is confusing if you are using the composited 
values to fine tuning the color. Maybe it is not a bug, but it is confusing 
that color dialog and composited RGB values don't show the same values.

Carlos

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>Comment By: dooglus (dooglus)
Date: 2007-09-25 02:19

Message:
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If you don't want visually linear colors, uncheck file > setup > misc >
visually linear colors.

You're probably right about the composite display though - perhaps they
should show the visually adjusted numbers as well if that feature (the
default) is enabled.

I'll look at it tomorrow.

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