pambrighten

adjusts brightness and saturation of Netpbm images using HSV color model

TLDR

Increase image brightness by 50%

$ pambrighten -value 50 [input.pam] > [output.pam]

Decrease saturation by 30%

$ pambrighten -saturation -30 [input.pam] > [output.pam]

Adjust both brightness and saturation

$ pambrighten -value [20] -saturation [10] [input.pam] > [output.pam]

Read from stdin

$ cat [input.pam] | pambrighten -value [50] > [output.pam]

SYNOPSIS

pambrighten [-value n] [-saturation n] [file]

pambrighten increases or decreases the Saturation and Value (from the HSV color space) of each pixel of a Netpbm image by a specified percentage. Positive values increase, negative values decrease. If no file is specified, reads from stdin.Minimum unique abbreviation of option names is acceptable. Double hyphens may be used instead of single hyphens. Part of the Netpbm toolkit.

PARAMETERS

-value n

Change Value (brightness) by percentage. May be negative. Default is 0.

-saturation n

Change Saturation by percentage. May be negative. Default is 0.

INSTALL

sudo apt install netpbm

sudo dnf install netpbm

sudo pacman -S netpbm

sudo apk add netpbm

sudo zypper install netpbm

brew install netpbm

nix profile install nixpkgs#netpbm