Re: [APML] Correcting for Chromatic Aberrations in Processing

["glennlray" <glennlray@mail.ev1.net>]

Jason,

Many on the list use Registar to re-register the RGB channels of color (or tri-color images).  Picture Window also has a chromatic aberration tool for adjusting lens aberration around the edges.  I've also used Photoshop to manually adjust RGB channels.

To adjust for instrument/recording medium adjustment (ex. achromatic aberration, instrument/film blooming/halation), you can use techniques like Matt BenDaniel's star shaping technique on individual channels to various degrees.  His article on the technique can be found here:
http://www.starmatt.com/articles/StarShaping.html

You might want to search the APML archives for more information:
http://astro.umsystem.edu/apml/

Glenn Ray
Cypress, TX

---------- Original Message ----------------------------------
From: "Lane, Jason R" <jason.lane@navy.mil>
Reply-To: Discussion of Film Astrophotography <astro-photo@seds.org>
Date: Wed, 14 Jan 2004 13:44:04 -0800

>Hi all,
>
>I am curious as to what methods could be used to adjust for chromatic aberrations in an image...ie blue halo around stars, spherochromatism, etc. etc. ?  
>
>Thanks,
>Jason Lane
>
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