Wiki Home

List New Updates

Find Page

Back To
The Web Site

Back To
The Journal



Wiki: Defending The Reputation Of Jpeg Compression

GIF has two major compression methods: 1) RLEncoding and 2) the Palette Lookup color table.

JPEG has two as well: 1) Discrete Cosine Transform or Wavelet Transform and 2) Reduction of Hue and Saturation in favor of Luminance

- Ross

JPEG uses the discrete cosine transform and JPEG2000 uses the wavelet transform. For both techniques, degradation (or loss) comes from the quantizer stage, which follows the transform stage. It is in this stage that data is "thrown out" so that the result an be compressed.

[Photoshop uses] the Nigel Tufnel-trick to force the program mode to switch over to a truly loseless version of the JPEG algorithm.

- Ken Prager

-- Last edited December 29, 2004
- Click any question mark to add a new page.

Search on: Defending The Reputation Of Jpeg Compression





Notes Mode Ghia Mac Mail Up Home