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Ilib Image Library
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About Ilib

What is it?

Ilib is a library (and some tools and examples) written in C that can read, create, manipulate and save images. It is capable of using X11 BDF fonts for drawing text. (X11 BDF fonts are part of the UNIX-based X11 Windows System, original developed at MIT in the early 1990s.) That means you get lots (208, to be exact) of fonts to use. You can even create your own if you know how to create an X11 BDF font. It can read and write PPM, XPM, GIF, PNG and JPG image format.

There is a Perl module included with the distribution. It does not yet support the complete Ilib API, but it's a start.

For more information on X11 (aka "XWindows"), go to XFree86.org, maintainers of the open source x86-based version.

What can I use it for?

It's great for generating graphs and creating GIF output from CGIs. There are also some useful applications bundled with it. For example, there's a tool for generating index images (aka "thumbnails"). See the Screenshots to see what the output looks like.

What platforms does it run on?

It is portable enough to work with the old K&R C compilers and it will compile under ANSI C. It has been compiled and run on both UNIX and Windows 95/98/2000/NT/XP (MS Visual C++ and win32 gcc).

What image formats does it support?

PPM (raw)YesYes
PPM (ascii)NoYes
PGM (raw)YesYes
1With optional Giflib/Libungif
2With optional libpng (does not support writing colormapped images)
3With optional libjpeg

It natively supports PGM, PPM, PAM and XPM. With optional external libraries it supports other formats as outlined to the right.

Who can use it?

Anyone. Just follow the guidelines of the GNU General Public License.

Is it hard to use?

It's fairly simple to use. Here's a simple program to fill a rectangle, draw some lines and then some text: sample.c.

The API is available online.

What's the latest version?

Version 1.1.9 was released on 25 Oct 2004.

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