pnmindex
Create thumbnail contact sheets from images
TLDR
Create image index
$ pnmindex [image1.pnm] [image2.pnm] [image3.pnm] > [index.pnm]
Specify size$ pnmindex -size [100] [*.pnm] > [index.pnm]
With labels$ pnmindex -title [*.pnm] > [index.pnm]
Multiple columns$ pnmindex -across [4] [*.pnm] > [index.pnm]
SYNOPSIS
pnmindex [options] pnmfiles...
DESCRIPTION
pnmindex creates a visual index (contact sheet) from multiple PNM images. Each image is scaled to a thumbnail and arranged in a grid.
Useful for creating image previews and galleries.
PARAMETERS
-size n
Size of each thumbnail.-across n
Number of images per row.-colors n
Number of colors.-title
Add filenames as titles.-black
Black background.-quant
Quantize colors.
EXAMPLES
$ # Create index of all PPM files
pnmindex *.ppm > index.ppm
# Thumbnails 150 pixels, 5 across
pnmindex -size 150 -across 5 photos/*.ppm > gallery.ppm
# With labels on black
pnmindex -title -black images/*.pnm > contact.ppm
# Convert to JPEG
pnmindex *.pnm | pnmtojpeg > index.jpg
pnmindex *.ppm > index.ppm
# Thumbnails 150 pixels, 5 across
pnmindex -size 150 -across 5 photos/*.ppm > gallery.ppm
# With labels on black
pnmindex -title -black images/*.pnm > contact.ppm
# Convert to JPEG
pnmindex *.pnm | pnmtojpeg > index.jpg
CAVEATS
Large numbers of images can produce huge output. Consider pamundice for splitting back.
HISTORY
pnmindex is part of Netpbm, providing contact sheet generation since early Pbmplus versions.
