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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
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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
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362:– 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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271:; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled
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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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627:{{Information |Description=I needed a test image to be used in some examples of image processing. In books
368:– If you remix, transform, or build upon the material, you must distribute your contributions under the
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I needed a test image to be used in some examples of image processing. In books and articles,
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Permission is granted to copy, distribute and/or modify this document under the terms of the
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a lossless PNG to save the higher frequencies that could be removed by a JPEG compression.
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is commonly used, but I can't use it on
Commons because it is not in the public domain.
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I, the copyright holder of this work, hereby publish it under the following license:
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Click on a date/time to view the file as it appeared at that time.
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I took a look at the featured pictures, and I have decided to use
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This licensing tag was added to this file as part of the GFDL
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Those are the pictures I have created starting from this one:
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Add a one-line explanation of what this file represents
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Creative
Commons Attribution-ShareAlike 3.0 Unported
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Commons is a freely licensed media file repository.
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192:date QS:P,+2001-00-00T00:00:00Z/9,P4241,Q40720568
51:(512 × 512 pixels, file size: 348 KB, MIME type:
389:http://creativecommons.org/licenses/by-sa/3.0/
231:The original uncropped high-resolution version
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395:Creative Commons Attribution-Share Alike 3.0
345:– to copy, distribute and transmit the work
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111:Lichtenstein img processing test.png
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392:CC BY-SA 3.0
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87:You can help
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22:File history
473:copyrighted
366:share alike
360:attribution
190:Autumn 2001
109:Description
637:File usage
614:512 × 512
584:512 × 512
560:Dimensions
27:File usage
622:Alejo2083
557:Thumbnail
554:Date/Time
326:license.
241:Licensing
130:artifacts
53:image/png
616:(357 KB)
586:(348 KB)
416:Captions
349:to remix
343:to share
571:current
566:Comment
440:depicts
420:English
132:due to
101:Summary
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209:Author
199:Source
629:Lenna
592:Gnash
118:Lenna
664:JPEG
646:JPEG
563:User
401:true
398:true
291:true
288:true
282:GFDL
187:Date
17:File
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55:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
