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tldr/pages/common/pnmgamma.md
Juri Dispan a47af264de
pamcomp, pnmcomp, pnmconvol, pnmcrop, pnmgamma: add pages (#12197) 
* pamcomp, pnmcomp, pnmconvol, pnmcrop, pnmgamma: add pages

* Update pages/common/pnmgamma.md

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
2024-02-06 23:12:53 +08:00

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pnmgamma

Perform gamma correction on PNM images. More information: https://netpbm.sourceforge.net/doc/pnmgamma.html.

  • Convert the image from BT.709 luminance to radiance or sRGB luminance:

pnmgamma -{{bt709tolinear|bt709tosrgb}} {{path/to/image.pnm}} > {{path/to/output.pnm}}

  • Convert the image from radiance or sRGB luminance to BT.709 luminance:

pnmgamma -{{lineartobt709|srgbtobt709}} {{path/to/image.pnm}} > {{path/to/output.pnm}}

  • Specify the gamma value used for the gamma transfer function:

pnmgamma -gamma {{value}} {{path/to/image.pnm}} > {{path/to/output.pnm}}

  • Specify the gamma value used for the gamma transfer function per color component:

pnmgamma -rgamma {{value}} -ggamma {{value}} -bgamma {{value}} {{path/to/image.pnm}} > {{path/to/output.pnm}}