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File:Lichtenstein img processing test.png

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Lichtenstein_img_processing_test.png (512 × 512 pixels, file size: 348 KB, MIME type: image/png)

Summary

Description

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
The original uncropped high-resolution version

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
GNU head 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.
w:en:Creative Commons
attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
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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.
This licensing tag was added to this file as part of the GFDL licensing update.

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Date/TimeThumbnailDimensionsUserComment
current01:52, 17 April 2017Thumbnail for version as of 01:52, 17 April 2017512 × 512 (348 KB)GnashOptimized file size.
18:02, 19 May 2007Thumbnail for version as of 18:02, 19 May 2007512 × 512 (357 KB)Alejo2083{{Information |Description=I needed a test image to be used in some examples of image processing. In books Lenna is commonly used, but I can't on Commons because it is not in the public domain. I took a look at the featured pictures, and I ha

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