File:JPEG 2000 Artifacts Demonstration.png

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Original file ‎(256 × 1,152 pixels, file size: 353 KB, MIME type: image/png)

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 — 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
Source File:LossyDemonstration-Original.png
Author Shlomi Tal
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Date/TimeThumbnailDimensionsUserComment
current08:26, 6 July 2019Thumbnail for version as of 08:26, 6 July 2019256 × 1,152 (353 KB)Alexis JazzReverted to version as of 19:23, 14 March 2006 (UTC) Can't be sure if metadata, color profiles or browser compatiblity was lost. These overwrites are not needed, MediaWiki handles this.
23:08, 5 July 2019Thumbnail for version as of 23:08, 5 July 2019256 × 1,152 (348 KB)C 1File size reduced by 5KB using OptiPNG, a lossless oprimizer/recompressor for PNG images. No changes made to image or meta data.
19:23, 14 March 2006Thumbnail for version as of 19:23, 14 March 2006256 × 1,152 (353 KB)Shlomital~commonswikiTop-to-bottom demonstration of the compression artifacts of JPEG 2000
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