pnmtojpeg
Convert PNM images to JPEG format
TLDR
Convert PNM to JPEG
$ pnmtojpeg [input.pnm] > [output.jpg]
Convert with quality$ pnmtojpeg -quality [85] [input.pnm] > [output.jpg]
Create progressive JPEG$ pnmtojpeg -progressive [input.pnm] > [output.jpg]
Optimize Huffman tables$ pnmtojpeg -optimize [input.pnm] > [output.jpg]
SYNOPSIS
pnmtojpeg [options] [file]
DESCRIPTION
pnmtojpeg converts PNM (PBM, PGM, PPM) images to JPEG/JFIF format. The -quality option controls the compression-to-quality tradeoff, with higher values producing larger files with better image quality.The -progressive option creates progressive JPEGs that render in increasing detail during loading. The -optimize flag reduces file size by computing optimal Huffman coding tables. The -grayscale option forces single-channel output even for color inputs. Part of the Netpbm toolkit.
PARAMETERS
-quality n
Quality (0-100, default 75).-progressive
Create progressive JPEG.-optimize
Optimize Huffman tables.-grayscale
Force grayscale output.-baseline
Force baseline JPEG.
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