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Graphic file formats

What is a file format?

We previously learned the way in which an image was coded to be shown on a monitor, however, when we want to store an image in a file, this format is not the most practical…
Indeed, we may want an image which takes up less memory space, or an image which can be increased in size without causing pixelation.

Thus, it is possible to store the image, describing it with an equation, in a file with a data structure, which will need to be decoded by the processor before the information is sent to the graphics card:

Types of file formats

There are a great number of file formats. The most commonly used graphic file formats are the following:

Format Compression Maximum dimensions Maximum number of colours
BMP None /RLE 65 536 x 65 536 16 777 216
GIF LZW 65 536 x 65 536 256
IFF None /RLE 65 536 x 65 536 over 16,777,216
JPEG JPEG 65 536 x 65 536 over 16,777,216
PCX None /RLE 65 536 x 65 536 16 777 216
PNG RLE 65 536 x 65 536 over 16,777,216
TGA None /RLE 65 536 x 65 536 over 16,777,216
TIFF/TIF Packbits / CCITT G3&4 / RLE / JPEG / LZW / UIT-T 232-1 over 16,777,216


Last update on Thursday October 16, 2008 02:43:16 PM.
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