page_title: JPEG 2000
section_title: Improvements over the 1992 JPEG standard
hierarchical_section_title: JPEG 2000 / Improvements over the 1992 JPEG standard
caption_attribution_description: This image is a PNG for the demonstration of the compression artifacts of JPEG 2000. I (Shlomi Tal) took the photo of the dog and used it for the demonstration pictures on the Lossy Data Compression page on the Hebrew Wikipedia. There the demonstration is with JPEG, so there are four separate pictures &#8212; the original PNG and three JPEGs of differing quality. But this cannot yet be done for JPEG 2000, because of lack of browser support. I converted the PNG (1:1) to JPEG 2000 files in compression ratios of 1:5, 1:10, 1:20, 1:50 and 1:100, then converted all six files into PPM (Portable Pixelmap) and merged them into a single image using pnmcat (from the Netpbm package), and finally converted the result into PNG and optimized it. Optimized with "Kashmir Web Optimizer" (free): http://hosting05.imagecross.com/image-hosting-16/6156JPEG_2000_Artifacts_Demonstration.png
context_page_description: JPEG 2000 is an image compression standard and coding system. It was developed from 1997 to 2000 by a Joint Photographic Experts Group committee chaired by Touradj Ebrahimi, with the intention of superseding their original discrete cosine transform based JPEG standard with a newly designed, wavelet-based method. The standardized filename extension is .jp2 for ISO/IEC 15444-1 conforming files and .jpx for the extended part-2 specifications, published as ISO/IEC 15444-2. The registered MIME types are defined in RFC 3745. For ISO/IEC 15444-1 it is image/jp2.
  JPEG 2000 code streams are regions of interest that offer several mechanisms to support spatial random access or region of interest access at varying degrees of granularity. It is possible to store different parts of the same picture using different quality.
  JPEG 2000 is a discrete wavelet transform based compression standard that could be adapted for motion imaging video compression with the Motion JPEG 2000 extension. JPEG 2000 technology was selected as the video coding standard for digital cinema in 2004.
caption: Top-to-bottom demonstration of the artifacts of JPEG 2000 compression. The numbers indicate the compression ratio used.
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