File:Lichtenstein jpeg difference.png
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Lichtenstein_jpeg_difference.png (512 × 512 pixels, file size: 370 KB, MIME type: image/png)
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| Description |
The picture shows the difference pixel-by-pixel between an image and its JPEG 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. Then I have converted it to JPEG using the "convert" utility by ImageMagik, with the following command: convert -quality 50 castle.png castle.jpg Then I have used the following Matlab code: %read original image
original=imread('castle.png');
%read compressed image
compressed=imread('castle.jpg');
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.png');
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| Date | |
| Source | Own work |
| Author | Alessio Damato |
| Other versions |
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Licensing
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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.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
You may select the license of your choice.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:52, 17 April 2017 | | 512 × 512 (370 KB) | Gnash (talk | contribs) | Optimized file size. |
| 19:23, 19 May 2007 |  | 512 × 512 (387 KB) | Alejo2083 (talk | contribs) | optimized png | |
| 19:22, 19 May 2007 |  | 512 × 512 (523 KB) | Alejo2083 (talk | contribs) | {{Information |Description=The picture shows the difference pixel-by-pixel between an image and its JPEG compressed version: white=no-difference; black=big-difference The original image is Image:Lichtenstein img processing test.png, that I have ren |
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