.Dd Created:2025-10-13|Updated:2025-10-13|
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.Dt NETPBM oh
.Os linux OpenBSD 7.7|
.Nm netpbm 
.Nd usage and examples
.Sh DESCRIPTION
Netpbm is an image manipulation set packages.
.Sh CONVERSION
All packages output to stdin, they need to be redirected to a file or piped to another program as shown in the example.
.Ss text to image
.Dl asciitopgm HEIGHT WIDTH ASCIIFILE
.Ss image crop
.Dl pnmcrop [-white|-black] IMAGE_FILE
.Ss enlarge
.Dl pamenlarge -scale INT_SCALE IMAGE_FILE
.Ss convert to jpeg
.Dl pnmtojpeg IMAGE_FILE
.Sh EXAMPLE
This is the code used to create the favicon for this site:
.Bd -literal -compact
(echo "#######" && figlet -f letter O | tr ' o' '##' | sed "s/^/#/;3s/#O###O/#O---O/") | \e
asciitopgm 100 100 - | pnmcrop -white | pamenlarge -scale 200 | pnmtojpeg > netpbm_example.jpeg
.Ed
.Ss result
.In /netpbm_example.jpeg
.Sh TODO
.Bl -dash -compact
.It
Expand this document: this document was created after generating the favicon, needs further review and examples.
.El
.Sh SEE ALSO
.oxr figlet oh
.Xr text_manipulation oh
.opsy ArchLinux manpages:
.Xr netpbm
.El
.Ss links
.obc2
.It - Lk https://netpbm.sourceforge.net/ Netpbm at SourceForge
.El
.Sh AUTHORS
.An -nosplit
.Xr ohazot oh |
.Xr about oh |
.Lk https://ohazot.com ohazot.com
.Aq Mt admin@ohazot.com