Starlight Xpress SXV-M25C - Manual (Page 20)

Handbook for the SXV-M25C Issue 1 June 2004
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Other things to try include summing several images for a better signal to noise ratio.
This MUST be done AFTER colour synthesis, as summing raw images is very likely
to destroy the filter grid pattern and so prevent the creation of a proper colour image.
Summing can be done in the ‘Merge’ menu and involves loading the first processed
image, selecting a reference point (a star) then loading the second image and finding
the same star with the mouse. Once the reference is selected, you can either add
directly, or average the images together. Averaging is generally better, as you are less
likely to saturate the highlights of the picture. The signal-to-noise ratio will improve