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Lichtenstein_jpeg_difference.png (512 × 512 pixels, file size: 370 KB, MIME type: image/png)
Summary
DescriptionLichtenstein jpeg difference.png |
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'); |
Date | |
Source | Own work |
Author | Alessio Damato |
Other versions |
Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
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.
Items portrayed in this file
depicts
creator
some value
Wikimedia username: Alejo2083
author name string: Alessio Damato
copyright status
copyrighted
copyright license
Creative Commons Attribution-ShareAlike 3.0 Unported
Creative Commons Attribution-ShareAlike 2.5 Generic
GNU Free Documentation License, version 1.2 or later
Creative Commons Attribution-ShareAlike 2.0 Generic
Creative Commons Attribution-ShareAlike 1.0 Generic
inception
19 May 2007
source of file
original creation by uploader
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 01:52, 17 April 2017 | 512 × 512 (370 KB) | Gnash | Optimized file size. | |
19:23, 19 May 2007 | 512 × 512 (387 KB) | Alejo2083 | optimized png | ||
19:22, 19 May 2007 | 512 × 512 (523 KB) | Alejo2083 | {{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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