M13 Globular Cluster Colorful Bullseye Effect

[Starry Eyes]

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

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

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?...

What to do

[Starry Eyes]

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!

Maybe there's some more dynamic range?

Color bias all 100%, as sampled!

[admin]

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