StarTools and Modern Art

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

StarTools and Modern Art

Postby bobequus » Mon May 06, 2019 11:44 am

Just curious. . . anyone ever get an image like this?
Capture.JPG
Capture.JPG (223.28 KiB) Viewed 577 times


The Pleiades. Canon T6i. 80 light frames stacked in DSS using Auto Adaptive with Bias and Offset, no Darks. Image produced after 'Autodev'.
I've been trying to learn StarTools for about 3 months with very limited success. Perhaps I should stick to making 'art' with it.

Bobby
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Re: StarTools and Modern Art

Postby admin » Mon May 06, 2019 11:33 pm

Hi Bobby,

This doesn't seem to be so much a StarTools issue, rather it is an issue with your dataset.
This behavior can happen if your dataset has values that are unnaturally smooth (e.g. large areas all with the same values, indicating no signal at all), or if your dataset has values that fall outside the allowable range specified in the image file header. What StarTools is doing in that case, is interpolating the faulty data values, hoping for the best. If most values are unusable for interpolation (because they are all corrupt, missing or containing 0 signal), the image you posted is the result; some stars poking through, but everything else interpolated because of bad values/signal.

If you are using DSS, for best results use setting similar to here;
https://www.startools.org/modules/intro ... uick-start

Can you confirm you are stacking RAW (e.g. CR2/ARW/NEF) files and not JPEGs?
Can you confirm you are not pre-processing the files CR2/ARW/NEF with any other software before passing to DSS?
Can you confirm you are not pre-processing the stack with any other software before passing to StarTools?
Can you confirm you are getting the same result if you just stack the light frames without further calibration frames?

If you wish for us to have a look at your dataset, please feel free to upload it to GoogleDrive, Dropbox, etc. and share a link to it.

Do let us know if any of the above was helpful.
Ivo Jager
StarTools creator and astronomy enthusiast
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