Course glossary


Browse the glossary using this index

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G

GIF image format

Pros
  • Universally supported for animation.
Cons
  • 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)

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J

JPG image format

Pros
  • Compresses the files quite efficiently.
  • Universally supported for display.
Cons
  • 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

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P

PNG image format

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

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R

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.

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