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Equations/Details of the Color Transformations

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Equations/Details of the Color Transformations Simone80 16 Apr 19:32
  Equations/Details of the Color Transformations Øyvind Kolås 17 Apr 13:20
Simone80
2020-04-16 19:32:26 UTC (over 4 years ago)
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Equations/Details of the Color Transformations

Hi All,

I am interested in the color transformations of the tools like brightness-contrast, hue-chroma, hue-saturation, saturation, exposure, color balance, color temperature, ...

Do you know where I can find the details of these tools, in particular the mathematical equations behind them?

Thank you in advance for your help.

Simone

Simone80 (via www.gimpusers.com/forums)
Øyvind Kolås
2020-04-17 13:20:41 UTC (over 4 years ago)

Equations/Details of the Color Transformations

For most of these filters you find the code and innerloop; which ends up containing the most important bits of the formula in the sources for the GEGL operations, like gegl/operations/common/exposure.c and also in the folder gegl/operations/common-gpl3+ . However beware that the innerloop does not tell the whole story; as operations also constrain the type of pixel encodings they accept. For instance gegl:exposure ensures that the component values are linear, the math would be wrong if applied to 8bit sRGB data or floating point sRGB data.

/pippin

On Thu, Apr 16, 2020 at 9:34 PM Simone80 wrote:

Hi All,

I am interested in the color transformations of the tools like brightness-contrast, hue-chroma, hue-saturation, saturation, exposure, color balance, color temperature, ...

Do you know where I can find the details of these tools, in particular the mathematical equations behind them?

Thank you in advance for your help.

Simone

-- Simone80 (via www.gimpusers.com/forums) _______________________________________________ gimp-user-list mailing list
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