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==Stacking==
==Stacking==


The final thing to do with Siril is to stack the images. Go to the "processing" tab, indicate if you want to stack all images or only selected images (the third option is not yet implemented). Then simply click on "Start summing stack" which is the regular stack. The median stack is mostly used to create pre-processing frames, like offsets or darks.
The final thing to do with Siril is to stack the images. Go to the "stacking" tab, indicate if you want to stack all images, only selected images or the best images regarding the value of FWHM previously computed. Then simply click on "Sum Stacking" which is the regular stack. The Median Stacking is mostly used to create pre-processing frames, like offsets or darks and Pixel Maximum Stacking is very usefull for star trail pictures.


[[File:Siril stacking screen.png]]
[[File:Siril stacking screen.png]]


After that, the result is saved in the file named below the buttons, and is displayed in the grey and colour windows. You can adjust levels if you want to see it better, but that will not be saved in the FITS file.
After that, the result is saved in the file named below the buttons, and is displayed in the grey and colour windows. You can adjust levels if you want to see it better, or use the different display mode. In our example the file is the stack result of the 80% best files, i.e., 96 over 119 files.


[[File:Siril stacking result.png|700px]]
[[File:Siril stacking result.png|700px]]


An export of the RGB composed image is being implemented, in order to use Siril's composition and level adjustment, but I recommend using an external tool such as the wonderful [[DS9]] to adjust your levels. In particular, I use the asinh scaling for blue and green data because they are generally much less equalized than the red when using an unfiltered DSLR camera. Then, you can export the image and adjust final contrast and lightness in The Gimp for example. The following image has been created during this tutorial and edited in this way, from 8 20s images with a high background noise, no autoguiding and a very high periodic error.
The image above shows you the result displayed in Siril with the Histogram Equalization tool. Note the increase of the signal to noise ration regarding the result given for one frame in the previous [[Siril:Tutorial_preprocessing|step]].
 
[[File:M27_siril-stack8_ds9-composition_gimp-contrast.jpeg|700px]]




End of the [[Siril:Manual#Tutorial_for_a_complete_processing|processing tutorial]]. Return to the [[Siril:Manual|main documentation page]] for more illustrated tutorials.
End of the [[Siril:Manual#Tutorial_for_a_complete_processing|processing tutorial]]. Return to the [[Siril:Manual|main documentation page]] for more illustrated tutorials.

Revision as of 12:56, 2 August 2014

Siril processing tutorial

Stacking

The final thing to do with Siril is to stack the images. Go to the "stacking" tab, indicate if you want to stack all images, only selected images or the best images regarding the value of FWHM previously computed. Then simply click on "Sum Stacking" which is the regular stack. The Median Stacking is mostly used to create pre-processing frames, like offsets or darks and Pixel Maximum Stacking is very usefull for star trail pictures.

After that, the result is saved in the file named below the buttons, and is displayed in the grey and colour windows. You can adjust levels if you want to see it better, or use the different display mode. In our example the file is the stack result of the 80% best files, i.e., 96 over 119 files.

The image above shows you the result displayed in Siril with the Histogram Equalization tool. Note the increase of the signal to noise ration regarding the result given for one frame in the previous step.


End of the processing tutorial. Return to the main documentation page for more illustrated tutorials.

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