This document discusses different image compression formats including GIF, PNG, JPEG, and MNG. It provides details on each format such as the algorithms and applications used. GIF uses LZW lossless compression while JPEG uses lossy compression to reduce file sizes. PNG also uses lossless compression with DEFLATE and prediction algorithms. The objective of image compression is to reduce file sizes by eliminating redundant image data through either lossy or lossless compression methods.

1. A presentationIMAGE COMPRESSIONGuided by: Prof. N. A. NEMADEby: Manish kumarAbhishekranjanPrashantwagh

2. Why image compression?The image compression are required for providing the proper image Format for different devices or application which can be distinguished On the basis of their platform and rendering type.For Web based applications

3. Provides Different image formats

4. Provides basics for video compressionIMAGE COMPRESSIONGIF (GRAPHICS INTERCHANGE FORMAT)

5. PNG (PORTABLE NETWORK GRAPHICS

6. MNG (MULTIPLE-IMAGE NETWORK GRAPHICS)

7. JPEG (JOIN PICTURE EXPERT GROUPGIF (GRAPHICS INTERCHANGE FORMAT)Introduced by CompuServe in 1987 (GIF87a)

8. Support for multiple images in one file and metadata adding in 1989 (GIF89a)

9. Indexed image format: up to 256 colours per image, chosen from a variable palette.

10. One colour index can indicate transparency.

11. Uses lossless LZW compression of data bytes.

12. Optional interlacing capabilityGIF UsesGIF became very popular in the early days of the Web.

13. Supported by NCSA Mosaic.

14. Pretty good compression.

15. Most displays then were indexed rather than truecolor.

16. Today it’s still good for diagrams, cartoons, and other nonphotographic images.Lossless encoding good for sharp edges (doesn’t blur).PNG (Portable Network Graphics)Supports truecolor, greyscale, and palette-based (8 bit) colourmaps.