M13 Globular Cluster Colorful Bullseye Effect

Questions and answers about processing in StarTools and how to accomplish certain tasks.

M13 Globular Cluster Colorful Bullseye Effect

Postby Starry Eyes » Fri Jan 03, 2014 8:49 pm

Here is an exaggerated example of an effect that I encounter during processing globular clusters.

Image

And for a more tasteful rendition with some hand editing of the center bullseye...

Image

Same set of Data. 42@80"@ iso 200. Canon XSi unmodded. 6" F5 Newt w beral coatings. Paracorr. Stacked linear in DSS. ST1.3.5.271 Masked stars used for sample for color module.

So data a little burned out in the center? Dynamic range issue? Reality?... :confusion-shrug:

What to do :think:
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Re: M13 Globular Cluster Colorful Bullseye Effect

Postby Starry Eyes » Sat Jan 04, 2014 1:03 am

I was perusing the forum topics and saw a mention about 32 bit int fits files for output from DSS. So I tried one for my M13 data.

Interesting! :D

Image

Maybe there's some more dynamic range? :think:

Color bias all 100%, as sampled!
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Re: M13 Globular Cluster Colorful Bullseye Effect

Postby admin » Sat Jan 04, 2014 10:54 pm

Interesting indeed! I wonder why the bit-depth made such a big difference?
Ivo Jager
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