Beyond Linux From Scratch - Version 6.1

Chapter 9. Graphics and Font Libraries

Libungif-4.1.3

Introduction to Libungif

The libungif package contains libraries for reading all GIFs and writing non-compressed ones as well as programs for converting and working with GIF files. The libraries are useful for any graphics program wishing to deal with GIF files while the programs are useful for conversion purposes as well as cleaning up images.

The reason libungif only writes non-compressed GIFs is due to a legal issue with LZW compression (which Unisys claimed a patent on). Reading GIFs is not a problem as the decompression routines do not seem to be limited in this way. Note that this has in the past been disputed. The best way to avoid this whole mess is to simply use libungif for looking at GIF images on the web, while in any pages which you design, use the open source PNG format instead (which uses, not surprisingly, the libpng library) which has no patent issues at all.

Package Information

Libungif Dependencies

Optional

X (XFree86-4.5.0 or X.org-6.8.2)

Installation of Libungif

Install libungif by running the following commands: 

./configure --prefix=/usr &&
make

This package does not come with a test suite.

Now, as the root user: 

make install &&
install -v -m755 -d /usr/share/doc/libungif-4.1.3/html &&
install -v -m644 doc/*.{png,html} \
    /usr/share/doc/libungif-4.1.3/html &&
install -v -m644 doc/*.txt \
    /usr/share/doc/libungif-4.1.3

Contents

Installed Programs: gif2epsn, gif2ps, gif2rgb, gif2x11, gifasm, gifbg, gifburst, gifclip, gifclrmp, gifcolor, gifcomb, gifcompose, giffiltr, giffix, gifflip, gifhisto, gifinfo, gifinter, gifinto, gifovly, gifpos, gifrotat, gifrsize, gifspnge, giftext, gifwedge, icon2gif, raw2gif, rgb2gif, and text2gif
Installed Library: libungif.[so,a]
Installed Directory: /usr/share/doc/libungif-4.1.3

Short Descriptions

gif2epsn

dumps images saved as GIF files on Epson type printers.

gif2ps

print GIF files on laser printers supporting PostScript.

gif2rgb

convert images saved as GIF to 24-bit RGB image(s).

gif2x11

display images saved as GIF files under X Window System.

gifasm

assemble multiple GIFs into one, or burst a multiple-image GIF.

gifbg

generate a single-color test pattern GIF.

gifburst

burst a GIF image into subrectangles.

gifclip

clip or crop a GIF image.

gifclrmp

modify GIF image colormaps.

gifcolor

generate color test patterns.

gifcomb

combine 2 GIF images of exactly the same size into one.

gifcompose

use (un)giflib tools to compose images.

giffiltr

template code for filtering a GIF sequentially.

giffix

clumsily attempts to fix truncated GIF images.

gifflip

flip GIF image along X or Y axis or rotate by 90 degrees.

gifhisto

generate color-frequency histogram from a GIF.

gifinfo

gives information on a GIF file.

gifinter

convert between interlaced and non-interlaced images.

gifinto

end-of-pipe fitting for GIF-processing pipelines.

gifo-libungifvly

generate one composite GIF from a multiple-image GIF.

gifpos

change a GIF's screen size or recondition it.

gifrotat

rotate a GIF through any desired angle.

gifrsize

resize a GIF by deletion or duplication of bits.

gifspnge

template code for filtering a GIF with in-core operations.

giftext

print (text only) general information about a GIF.

gifwedge

create a test GIF image resembling a color monitor test pattern.

icon2gif

converter/deconverter to/from an editable text format.

raw2gif

convert raw 8-bit image data into GIF files.

rgb2gif

convert 24 bit images to a GIF image using color quantization.

text2gif

generate GIF images out of regular text in 8x8 font.

Last updated on 2005-08-01 13:29:19 -0600