Pixelation is a message board about pixel art, first and foremost. Its role is to provide a setting in which people may sharpen their skills by posting work and receiving critique from others, and to offer critique when others request it.

The Independent Qt Tutorial is an on-line book aiming to cover most topics involved in the process of developing professional quality Qt applications. The text is example driven, filled with lots of tips and has links to the official Qt documentation.

The optical appearance of the stellar sky for an observer in the vicinity of a black hole is dominated by bending of light, frequency shift, and magnification caused by gravitational lensing and aberration. Due to the finite apperture of an observer's eye or a telescope, Fraunhofer diffraction has to be taken into account. Using todays high performance graphics hardware, we have developed a Qt application which enables the user to interactively explore the stellar sky in the vicinity of a Schwarzschild black hole. For that, we determine what an observer, who can either move quasistatically around the black hole or follow a timelike radial geodesic, would actually see.

Choose from a comprehensive collection of select royalty-free photos, vectors and illustrations from Getty Images, iStockphoto and Jupiterimages.

With OpenGL, you can control computer-graphics technology to produce realistic pictures or ones that depart from reality in imaginative ways. This guide explains how to program with the OpenGL graphics system to deliver the visual effect you want.

Having people tag images by hand is an onerous task. Shenoy and Tan of Microsoft Research developed a way to tag images automatically by reading people’s brain scans while they look at images. The people did not even have to specifically think about trying to tag the image; they merely had to passively observe it.

Griddlers are logic puzzles that use number clues around a grid to create an image.

YafaRay is a free open-source raytracing engine. Raytracing is a rendering technique for generating realistic images by tracing the path of light through a 3D scene.

An render engine consists of a "faceless" computer program that interacts with a host 3D application to provide very specific raytracing capabilties "on demand". Blender 3D is the host application of YafaRay.

In the paragraphs below, find a short description for each command-line tool. Click on the program name to get details about the program usage and a list of command-line options that alters how the program behaves. If you are just getting acquainted with ImageMagick, start with the convert program.

Have you ever asked yourself which of two given jpegs (same size) is the "original", i.e. which one was saved with higher quality? No? Then Go Away... Yes? Then Read On...