libnetpbm man page on SuSE

Man page or keyword search:  
man Server   14857 pages
apropos Keyword Search (all sections)
Output format
SuSE logo
[printable version]

Libnetpbm manual(3)					   Libnetpbm manual(3)

NAME
       libnetpbm - general introduction to the netpbm library

DESCRIPTION
       libnetpbm  is a C programming library for reading, writing, and manipu‐
       lating Netpbm images.  It also contains a few general graphics  manipu‐
       lation  tools,  but  it is not intended to be a graphics tools library.
       For graphics tools, Netpbm expects you  to  run	the  Netpbm  programs.
       From  a	C program, the libnetpbm function pm_system() makes this easy.
       However, since it creates a process and execs a program,	 this  may  be
       too heavyweight for some applications.

       To  use libnetpbm services in your C program, #include the pam.h inter‐
       face header file.  For historical reasons, you can also get by in  some
       cases  with  pbm.h, pgm.h, ppm.h, or pnm.h, but there's really no point
       to that anymore.

       The libnetpbm functions are divided into these categories:

       ·      PBM functions.  These have names that start with	pbm  and  work
	      only on PBM images.

       ·      PGM  functions.	These  have names that start with pgm and work
	      only on PGM images.

       ·      PPM functions.  These have names that start with	ppm  and  work
	      only on PPM images.

       ·      PNM functions.  These have names that start with pnm and work on
	      PBM, PGM, and PPM images.

       ·      PAM functions.  These also have names that start	with  pnm  and
	      work on all the Netpbm image types.

       ·      PM  functions.  These are utility functions that aren't specific
	      to any particular image format.

       For new programming, you rarely need to concern yourself with the  PBM,
       PGM,  PPM,  and	PNM  functions, because the newer PAM functions do the
       same thing and are easier to use.  For certain processing  of  bi-level
       images, the PBM functions are significantly more efficient, though.

       libnetpbm  has  a  backward compatibility feature that means a function
       designed to read one format can read some others too, converting on the
       fly.  In particular, a function that reads a PGM image will also read a
       PBM image, but converts it as it reads it so that for programming  pur‐
       poses,  it  is  a  PGM image.  Similarly, a function that reads PPM can
       read PBM and PGM as well.  And a function that reads PBM, PGM,  or  PPM
       can read a PAM that has an equivalent tuple type.

       For  each  of the five classes of libnetpbm image processing functions,
       libnetpbm has in in-memory representation for a pixel,  a  row,	and  a
       whole  image.  Do not confuse this format with the actual image format,
       as you would see in a file.  The libnetpbm in-memory format is designed
       to  make programming very easy.	It is sometimes extremely inefficient,
       even more than the actual image format.	For example, a	pixel  that  a
       PPM  image represents with 3 bytes, libnetpbm's PAM functions represent
       with 16 bytes.  A pixel in a PBM image is represented by a single  bit,
       but the PNM functions represent that pixel in memory with 96 bits.

       See  LibnetpbmUser'sManual(1)forthe basics on using libnetpbm in a pro‐
       gram.

       You can look up the reference information for a particular function  in
       ThelibnetpbmDirectory(1).

       Before Netpbm release 10 (June 2002), this library was split into four:
       libpbm, libpgm, libppm, and libpnm.  That's largely the reason for  the
       multiple sets of functions and scattered documentation.

netpbm documentation		 December 2003		   Libnetpbm manual(3)
[top]

List of man pages available for SuSE

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net