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26 lines
926 B
Plaintext
26 lines
926 B
Plaintext
---
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syntax: markdown
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tags: [tldr, common]
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source: https://github.com/tldr-pages/tldr.git
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---
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# pnmgamma
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> Perform gamma correction on PNM images.
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> More information: <https://netpbm.sourceforge.net/doc/pnmgamma.html>.
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- Convert the image from BT.709 luminance to radiance or sRGB luminance:
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`pnmgamma -{{bt709tolinear|bt709tosrgb}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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- Convert the image from radiance or sRGB luminance to BT.709 luminance:
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`pnmgamma -{{lineartobt709|srgbtobt709}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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- Specify the gamma value used for the gamma transfer function:
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`pnmgamma {{[-ga|-gamma]}} {{value}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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- Specify the gamma value used for the gamma transfer function per color component:
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`pnmgamma {{[-rg|-rgamma]}} {{value}} {{[-gg|-ggamma]}} {{value}} {{[-bg|-bgamma]}} {{value}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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