pnmgamma
Perform gamma correction on PNM images. tldr-pages
On several platforms
Several platforms
Convert the image from BT.709 luminance to radiance or sRGB luminance
pnmgamma -bt709tolinear path/to/image.pnm >path/to/output.pnmIdentifyConvert the image from radiance or sRGB luminance to BT.709 luminance
pnmgamma -lineartobt709 path/to/image.pnm >path/to/output.pnmIdentifySpecify the gamma value used for the gamma transfer function
pnmgamma -gamma value path/to/image.pnm >path/to/output.pnmIdentifySpecify 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.pnmIdentify