Posts Tagged ‘digital image’

Bits

In digital computers world bits are the smallest pieces of information that can be stored. One bit of information has a value of either “0” or “1”. This values correspond with the two states of a switch: “on” and “off”. The electronic switches used in computers are called transistors.

Artifacts – Part 2

In this second (and last) part we will talk about  Moire, Maze Artifacts, Noise and Sharpening Halos. Moire and Maze Artifacts If a scene contains areas with repetitive detail which exceeds the resolution of the camera, a wavy moire pattern can appear. Anti-alias filters reduce or eliminate moire but also reduce image sharpness. Sometimes, moire […]

Artifacts – Part 1

In digital photography artifacts refer to the undesirable modifications caused by the sensor, optics, and internal image processing algorithms of the camera. On low budget compact cameras these artifacts are more visible and easy to identify. On the other hand, top DSLR cameras will require a more careful analysis to identify these artifacts and most […]

Aliasing And Anti-Aliasing

All the pixels in a digital image have a square form. For this reason if you zoom in on areas where there are diagonal lines or circles, you will observe that they have a jagged appearance. This is the aliasing or steps effect. Here you can see an example: