Re: [APML] 1805 Redo with Mike's technique

[Chris1011@aol.com]

In a message dated 10/15/2001 4:02:25 PM Pacific Daylight Time, philip@astrocruise.com writes:


> blue 
> flaring on some stars cause by the lack of chromatic perfect-ness across 
> the spectrum.  


Flare is the used to describe extraneous light from poor baffling, shiny lens mount surfaces and internal reflections/ghost images caused by poor coatings. What you have there is classic lateral chromatic aberration (i.e. the blue image is slightly smaller than the red image). This means that the 3 colors don't quite register accross the frame. This may be fixable if you can extract the blue channel in Photoshop, increase its dimensions ever so slightly, and re-paste it back as a blue channel of the proper dimensions to fit the red channel. I notice that the red is also slightly different than the green. For a more perfect result, you might need to match the size of red to green and blue to green.

Roland Christen