Software: SharpCap 3.2, Fits Liberator; SiriL, GIMP.
L: 60x60s bin 1x1, 100 bias, 60 darks, 60 flats.
RGB: 60x20s, bin 3x3, 100 bias, 60 darks, 60 flats.
See https://starizona.com/tutorial/color-imaging-3/ Binned-Color LRGB section. The bin 3x3 enables reduction of RGB exposures to 1/3 of the L exposure and maintain colour balance.
- M13-LRGB-Vixen81s-Atik314E.jpg (172.86 KiB) Viewed 1208 times
The image processing software Siril has an option for RGB Compositing.
- SiriL-RGB-Compositing.PNG (33.56 KiB) Viewed 1208 times
This was my first serious attempt at LRGB imaging. The information from the Starizona website seems to hold up. I think the effect of the filters will require longer exposures (and guiding) for best results.
I have some red fringing to the left hand side of some stars to the upper left, which will mean a reprocess of the data to find out what is happening and to learn how to use the RGB compositing tool. https://free-astro.org/siril_doc-en/#RGB_Compositing
Dave