Talk:Chromatic aberration

From Wiki
Revision as of 12:54, 16 July 2008 by Dedalus (talk | contribs) (Great article on LCA/TCA)
Jump to: navigation, search

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 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)

The upcoming hugin package will contain a tool to automatically determine TCA correction parameters (tca_correct) to be use with fulla to correct TCA. Unfortunately I don't know enough about it to write something... --Erik Krause 21:54, 10 July 2008 (CEST)
As far as I know tca_correct only takes radial TCA into account, while the paper takes asymmetric distortion due to misalignment of lens elements into account as well (so called tangential distortion). Dedalus 12:54, 16 July 2008 (CEST)