Free png software for linux

pypng 0.0.9 is an excellent and must-have product which offers you a Python module to decode (read) and encode (write) PNG files. All PNG formats are supported. Pure Python so that it can be installed as easily as possible and used on different Python implementations.

eq2png is a simple Perl script to make it painless to produce Portable Network Graphic (PNG) images for OpenOffice Impress presentations (or for any other purpose I cant imagine).

Suppose you had a LaTeX snippet in a file named example-equation.tex: To produce the PNG image of this with black foreground and transparent background (the default), youd type:

eq2png example-equation.tex

INSTALLATION:

Youll need ImageMagick, dvips, and Perl.

Just copy the script somewhere into your path, and create a config file if you dont
like the default behavior.

EXAMPLE USAGE:

1) Produce an image of a equation at the command line:
eq2png int{a + b} = c -o intergral.png
If you dont specify an output file, it will default to eq.png
If you add the -b flag, it will make your equation bold (or try to). This is nice for presentations (where sometimes
thin lines dissapear).

2) Produce an image of .tex file snippet. The .tex file should only contain LaTeX code
code you want rendered (not preamble or other such stuff, which gets wrapped around your snippet).
For example, a file equation.tex might include one line, sum_{a}^b = x!.
You can then produce an image of this in the following way:
eq2png equation.tex #defaults to producing a png file with the same name, i.e., equation.png
or,
eq2png equation.tex -o outputfile.png #produce a png file with the name outputfile.png

NOTE: eq2png will only assume a filename is a .tex snippet if it ends in ".tex". So,
eq2png equation.eq
will produce a png image of the string equation.eq (probably not what you want).
To specify that the string is a filename, use the -f flag, e.g.,
eq2png -f equation.eq -o outputfile.png

NOTE: if you want to include LaTeX macros in your equations, just place a file named macros.tex (or symlink)
in your working directory. It will be included in the .tex code generated to produce your png file.

NOTE: if you need to include special LaTeX packages, see the config file stuff below.

Pytexipng provides a LaTeX formula converter to png images using a nice GTK gui.

Pytexipng can convert a LaTeX formula into a png image file that can be used on any WYSIWYG word processor application as OpenOffice.org Writer, Abiword or KWord.

pngcheck verifies the integrity of PNG, JNG and MNG files (by checking the internal 32-bit CRCs [checksums] and decompressing the image data); pngcheck can optionally dump almost all of the chunk-level information in the image in human-readable form.
For example, it can be used to print the basic statistics about an image (dimensions, bit depth, etc.); to list the color and transparency info in its palette (assuming it has one); or to extract the embedded text annotations.
All PNG and JNG chunks are supported, plus almost all MNG chunks (everything but PAST, MAGN, DISC, DROP, DBYK, ORDR, and pHYg). This is a command-line program with batch capabilities (e.g., "pngcheck *.png").
Enhancements:
- This version adds an option to colorize the output (using ANSI colors), enhances the verbose output for interlaced images, and fixes three bugs that showed up in the most recent release of the brokensuite test images.

Sixlegs PNG Library is a Java 1.1-compatible PNG decoder which features full compliance with the latest PNG specification.
Sixlegs PNG Library supports all valid bit depths (grayscale/color), interlacing, palette-indexed images, alpha/transparency, gamma correction, access to all standard chunk data, private chunk handling, progressive display, and more.
Main features:
- Java 1.1 and 1.2-compatible PNG decoders.
- Licensed under the GPL with library exception.
- Full conformance with the latest PNG specification
- Support for all chunk types.
- Simple private chunk handling.
Enhancements:
- Mostly minor bugfixes related to code coverage improvements.

a2ping.pl is a small tool written in Perl, used to convert between PS, EPS, and PDF and other page description formats.

a2ping is a Unix command line utility that converts many raster image and vector graphics formats to EPS or PDF and other page description formats.

Accepted input file formats are: PS (PostScript), EPS, PDF, PNG, JPEG, TIFF, PNM, BMP, GIF, LBM, XPM, PCX, and TGA.

Accepted output formats are: EPS, PCL5, PDF, PDF1, PBM, PGM, PPM, PS, markedEPS, markedPS, PNG, XWD, BMP, TIFF, JPEG, GIF, and XPM. a2ping delegates the low-level work to Ghostscript (GS), pdftops, and sam2p.

Only the first page of PDF and PS files are converted.