File:Lichtenstein img processing test.png
Lichtenstein_img_processing_test.png (512 × 512 像素,檔案大小:348 KB,MIME 類型:image/png)
說明
說明
摘要
[編輯]描述Lichtenstein 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: |
日期 |
2001年年秋季 date QS:P,+2001-00-00T00:00:00Z/9,P4241,Q40720568 , 10:00 - 12:00 |
來源 | Image:Lichtenstein.jpg |
作者 | Andreas Tille, cropped by Alessio Damato |
其他版本 |
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目前 | 2017年4月17日 (一) 01:52 | ![]() | 512 × 512(348 KB) | Gnash(留言 | 貢獻) | Optimized file size. |
2007年5月19日 (六) 18:02 | ![]() | 512 × 512(357 KB) | Alejo2083(留言 | 貢獻) | {{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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