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...

This simple program converts bitmap images to sounds, and vice versa. Every line of loaded image is assumed to be a spectrum of sound, and it is converted to sound signal by means of inverse Fourie transform, or ...

Photosounder is a one-of-a-kind image-sound editing program. It is unique in that it opens images and sounds indiscriminately, treats and processes them as images, and synthesizes them as sounds. Sounds, once turned into images, can be powerfully modified to achieve effects and results that couldn't be obtained in any other way, while images of all sorts reveal the infinite kinds of otherworldly sounds they contain. Ultimately, knowing how sounds look and how images sound, you'll be able to create images that sound like what you want to hear, or like what you couldn't imagine to hear.