File:Lichtenstein jpeg2000 difference.png
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Lichtenstein_jpeg2000_difference.png (512 × 512 pixels, file size: 394 KB, MIME type: image/png)
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Summary
| Description |
The picture shows the difference pixel-by-pixel between an image and its JPEG2000 compressed version: white=no-difference; black=big-difference The original image is Image:Lichtenstein img processing test.png, that I have renamed castle.png on my hard-disk to make it simpler. The I have converted it so JPEG2000 using the "convert" utility by ImageMagik, with the following command: convert -quality 50 castle.png castle.jp2 Then I had to reconvert the JPEG2000 version to PNG to be able to read it: convert castle.jp2 castle_2000.png The I have used the following Matlab code: %read original image
original=imread('castle.png');
%read compressed image
compressed=imread('castle_2000.png');
original=im2double(original);
compressed=im2double(compressed);
error=abs(original-compressed);
%amplify the error for each color layer
error(:,:,1)=imadjust(error(:,:,1));
error(:,:,2)=imadjust(error(:,:,2));
error(:,:,3)=imadjust(error(:,:,3));
%invert the picture
error=1-error;
%write it to a file
imwrite(error,'castle_error_2000.png');
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| Date | |
| Source | Own work |
| Author | Alessio Damato |
| Other versions |
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Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
  
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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | |
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| This licensing tag was added to this file as part of the GFDL licensing update. |
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
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You may select the license of your choice.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:27, 6 July 2019 | | 512 × 512 (394 KB) | Alexis Jazz | Reverted to version as of 19:11, 19 May 2007 (UTC) Can't be sure if metadata, color profiles or browser compatiblity was lost. These overwrites are not needed, MediaWiki handles this. |
| 23:35, 5 July 2019 |  | 512 × 512 (391 KB) | C 1 | File size reduced by 4KB using OptiPNG, a lossless optimizer/recompressor for PNG images. No changes made to image or metadata. | |
| 19:11, 19 May 2007 |  | 512 × 512 (394 KB) | Alejo2083 | {{Information |Description=The picture shows the difference pixel-by-pixel between an image and its JPEG2000 compressed version: white=no-difference; black=big-difference The original image is Image:Lichtenstein img processing test.png, that I have |
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