OptiPNG is a PNG optimizer that recompresses image files to a smaller
size, without losing any information. This program also converts
external formats (BMP, GIF, PNM; TIFF support is coming up) to optimized
PNG, and performs PNG integrity checks and corrections.
The idea has been inspired from pngcrush, and is explained in detail in
the PNG-Tech article "A guide to PNG optimization". The implementation
is carried forward in OptiPNG, which offers a faster execution per
trial, and a wider search space.
Panorama viewer using OpenGL
A set of command line (and one GUI) programs for reading, writing, manipulating
and viewing high-dynamic range (HDR) images and video frames.
PIDDLE - Plug-In Drawing, Does Little Else
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PIDDLE is a Python module for creating two-dimensional graphics in a
manner that is both cross-platform and cross-media; that is, it can
support screen graphics (e.g. QuickDraw, Windows, Tk) as well as file
output (PostScript, PDF, GIF, etc.). It makes use of the native 2D
drawing calls of each backend, for maximum efficiency and quality. It
works by defining a base class (piddle.Canvas) with methods for all
supported drawing primitives. A particular drawing context is provided
in the form of a derived class. PIDDLE applications will be able to
automatically select an appropriate backend for the user's environment.
Pngnq is a tool for quantizing PNG images in RGBA format.
Pngnq is an adaptation by Stuart Coyle of Greg Roelf's pnqquant using
Anthony Dekker's neuquant algorithm.
The neuquant algorithm uses a neural network to optimise the color map
selection. This is fast and quite accurate, giving good results on many
types of images.
The PNGwriter library, which requires libpng, allows you to plot to a 48-bit
PNG file, saving it directly to disk. Plotting is as easy as specifying the
red, green, and blue values and the x, y coordinates of the pixel. It includes
functions for plotting simple geometric shapes (circle, rect, line), reading
the colour of a pixel, reading in a whole PNG file (great for image analysis),
plotting and reading in HSV colourspace, and many others that might come in
handy.
PoDoFo is a library to work with the PDF file format. The name comes
from the first letter of PDF (Portable Document Format). A few tools
to work with PDF files are already included in the PoDoFo package.
Impressive is a program that displays PDF presentation slides with style.
Smooth alpha-blended slide transitions are provided for the sake of eye
candy, but in addition to this, Impressive offers some unique tools that
are very useful for presentations.
JpGraph is an OO class library for PHP. JpGraph makes it easy to
draw both "quick and dirty" graphs with a minimum of code and complex
professional looking graphs which requires a very fine grain of control.
The library assigns context sensitive default values for most parameters
which helps minimize the learning curve.
potrace is a Peter Selinger's GPLed utility for tracing
bitmaps - converting them into smooth, scalable images.
It accepts as input a bitmap B/W images (PBM, PGM, PPM
and BMP formats), and returns encapsulated PostScript
(EPS) as the default output. Other output format are
available: PS, SVG, Xfig, PGM, PDF and experimental
GimpPath.
You can create scalable images from scans, such as
logos, hand taken notes, etc. The resulting smooth
images can then be rendered at any resolution.