Browse the glossary using this indexSpecial
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.
- Small animated images.
- (in all other still-image uses PNG is a better alternative, and for bigger animation modern HTML supports video)
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.
- Display of photography
- Storage of photography
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.
- Web page widgets: banners, buttons, frames, etc…
- Computer graphics.
- Screenshots (unless this screenshot contain mostly a photo).
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.