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:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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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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