File:Lichtenstein img processing test.png
Lichtenstein_img_processing_test.png (512 × 512 pixels, file size: 348 KB, MIME type: image/png)
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Summary
DescriptionLichtenstein img processing test.png |
I needed a test image to be used in some examples of image processing. In books and articles, Lenna is commonly used, but I can't use it on Commons because it is not in the public domain. I took a look at the featured pictures, and I have decided to use Image:Lichtenstein.jpg because it has several details (higher frequencies) in the bottom left and almost no details (lower frequencies) in the top right, plus sharp edges (between the castle and the sky). It's not as pretty as Lenna, but it's a good compromise! Moreover, it was not taken with a digital camera, so it does not show the typical artifacts due to Bayer pattern. Using GIMP, I have cropped the original image in order to have a squared picture, then I have downscaled it to 512x512 pixels using bi-cubic interpolation: this way the smaller image should have all the frequencies and the artifacts of the original JPEG compression should be negligible. I saved it in a lossless PNG to save the higher frequencies that could be removed by a JPEG compression. Those are the pictures I have created starting from this one: |
Date |
Autumn 2001 date QS:P,+2001-00-00T00:00:00Z/9,P4241,Q40720568 , 10:00 - 12:00 |
Source | Image:Lichtenstein.jpg |
Author | Andreas Tille, cropped by Alessio Damato |
Other versions |
Licensing
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 |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:52, 17 April 2017 | 512 × 512 (348 KB) | commons>Gnash | Optimized file size. |
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