[newbie] assembling images with different exposure time

[Boris G]

Hello,

I'm a new user of PI. I've got 14  images  of 900 seconds of NGC 281 and 26 images of 300 seconds.
I used to work with DeepSkyStarker, with groups of different LIGHT images. Each group was calibrated with FLAT, BIAS, and DAK with coherent exposure time. DSS allow me to integrate thoses images of 900s ans 300s.
I would like to do the same thing with PI but i don't how.
Thank you in advance to any one who may be able to give me some ideas.

[lucchett]

You can use the HDR combination tool if your objective is to recover saturated areas.
Andrea

[Boris G]

 There is no saturated areas in this nabula.
The goal is to have more (in fact the double) signal.

[Juan Conejero]

Use the BatchPreprocessing script to calibrate each group with its corresponding darks and flats (the bias frames are the same) separately. Then use the StarAlignment tool to register all calibrated images with respect to the same reference image. Finally, use ImageIntegration to integrate everything in a single operation. ImageIntegration will compute appropriate image weights automatically to maximize SNR in the result.

[Boris G]

Thank you very much
Everything works well.

[Boris G]

An here is the result (SII - Ha - OIII)


Once again, thanks for the help

Boris

[Mark de Regt]

Glomming onto this thread, is it the same process when I have different exposure times to deal with saturated areas?

[Boris G]

I don't think so
For saturated area, you should look at this :

http://pixinsight.com/forum/index.php?topic=2320.0