Difference between revisions of "Talk:Chromatic aberration"

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(Strange Example caused by IR?)
 
(New section: Great article on LCA/TCA)
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==Strange Example==
 
==Strange Example==
 
In the strange example on the page are we perhaps seeing chromatic aberration of longer wavelength red (approaching near IR)? Most plants reflect a lot of longwave red (as made obvious in IR photographs of plants)... this would explain why correction for the plant would cause more problems for red elsewhere in the image. I'd only expect to see this if the error of the lens was fairly steep with respect to wavelength, but that wouldn't be shocking if the lens was designed for a sensor (film?) with less NIR response. --[[User:Gmaxwell|Gmaxwell]] 05:33, 30 October 2006 (CET)
 
In the strange example on the page are we perhaps seeing chromatic aberration of longer wavelength red (approaching near IR)? Most plants reflect a lot of longwave red (as made obvious in IR photographs of plants)... this would explain why correction for the plant would cause more problems for red elsewhere in the image. I'd only expect to see this if the error of the lens was fairly steep with respect to wavelength, but that wouldn't be shocking if the lens was designed for a sensor (film?) with less NIR response. --[[User:Gmaxwell|Gmaxwell]] 05:33, 30 October 2006 (CET)
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== Great article on LCA/TCA ==
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I found http://www.vsg.dcu.ie/papers/prl_2007_chrom.pdf an article to measure and correct LCA/TCA chromatic aberration. Based on a fundamental model it measures CA on a test image (chess board pattern) to calibrate a lens. [[User:Dedalus|Dedalus]] 22:59, 6 July 2008 (CEST)

Revision as of 20:59, 6 July 2008

Strange Example

In the strange example on the page are we perhaps seeing chromatic aberration of longer wavelength red (approaching near IR)? Most plants reflect a lot of longwave red (as made obvious in IR photographs of plants)... this would explain why correction for the plant would cause more problems for red elsewhere in the image. I'd only expect to see this if the error of the lens was fairly steep with respect to wavelength, but that wouldn't be shocking if the lens was designed for a sensor (film?) with less NIR response. --Gmaxwell 05:33, 30 October 2006 (CET)

Great article on LCA/TCA

I found http://www.vsg.dcu.ie/papers/prl_2007_chrom.pdf an article to measure and correct LCA/TCA chromatic aberration. Based on a fundamental model it measures CA on a test image (chess board pattern) to calibrate a lens. Dedalus 22:59, 6 July 2008 (CEST)