Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL


GIF image format

  • Universally supported for animation.
  • Only 256 colors per image, leads to blocky look.
  • (a modern variant supports 256 colors per frame, but GIMP doesn’t use it).
  • Supports transparency but only as fully transparent/fully opaque.
Recommended uses
  • Small animated images.
  • (in all other still-image uses PNG is a better alternative, and for bigger animation modern HTML supports video)

More ...


JPG image format

  • Compresses the files quite efficiently.
  • Universally supported for display.
  • Compression is “lossy” and it slightly alters the image data. In case of global changes (color, contrast…) repeated file editing will slowly degrade the image quality.
  • At good quality levels, compression is invisible in photography, but can be seen (so called “artifacts”) in computer-generated graphics and text.
  • Doesn’t support transparency.

Recommended uses

  • Display of photography
  • Storage of photography

More ...


PNG image format

  • Lossless format, all pixels are kept.
  • Supports partial transparency.
  • Produces small files with most computer graphics.
  • Supported by all browsers.
  • Complex images (photos) are bulky.
Recommended uses
  • Web page widgets: banners, buttons, frames, etc…
  • Computer graphics.
  • Screenshots (unless this screenshot contain mostly a photo).

More ...


RGB color model

The RGB color model is an additive color model in which red, green and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green and blue.

More ...