Graphics Formats

Graphics File Formats and Compression

Name	Number of Colors	Maximum Bit Depth	Compresion Method	Use For	Features
Graphic Interchange Format (GIF)	256	8	Lossless	Anything not photographic, such as line art or type	Transparency (GIF89a), Interlacing, Animation
Joint Photographics Experts Group (JPEG)	16.7 million	24	Lossy	Photographs	Support "true" color. Better compression (Up to 100:1)

These images were saved as a JPG file. The basic image was scanned at 75 DPI and saved in Paintshop Pro using different levels of compression.

Compression ratio set to 1.
File size 24.147 Kb.

Compression ratio set to 20.
Files size 7.778 Kb.

Compression ratio set to 50.
File size 4.689 Kb.

Compression ratio set to 75.
File size 3.122 Kb.

These images were saved as a 256 color GIF file.

Katharina saved as a 256 color GIF file.
File size 16.489 Kb.

Katharina saved as a 256 color GIF file with transparent background.
File size 15.714 Kb.

Effects of Bit Depth On a GIF File

File saved as an 8 bit file (256 colors). File size 16.486 Kb.	File saved as an 7 bit file (128 colors). File size 12.971 Kb.	File saved as an 6 bit file (64 colors). File size 10.472 Kb.
File saved as an 5 bit file (32 colors). File size 7.822 Kb.	File saved as an 4 bit file (16 colors). File size 6. 074 Kb.	File saved as an 3 bit file (8 colors). File size 4.599 Kb.

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