Iasus

Hi How do I determine the bias value to remove? Bias frames? Thanks Ias

Thanks for the advice guys. I'll take a look at SIRIL. Ias

Hi all Newbie to deep sky imaging here, having issues using DeepSkyStacker. I have some images of the Ring Nebula which I'm using to learn stacking. They are RAW .CR2 format, taken using a Canon 600D DSLR which has been astro-modified. The lights are not brilliant - big vignette due to moon, but I'm not bothered by that as I'm just trying to learn tools atm rather than make "good" images. I also have some images taken with a UHC filter which do not have the vignette anywhere like as bad but they suffer from the same problem described below. Imgur link shows reference images from my machine for this post: https://imgur.com/a/4ZbL4x3 including before/after stacking and the settings I'm using. My issue is this: On loading the light frames into DSS they look fine in terms of colour, DSS shows them as "Gray 16 bit" and correctly IDs the camera. I then stack them using the lights and darks, and the result is very greyed out, with little to no colour. This happens even with the images taken with the UHC filter which have little vignette, and with other objects. I've had a google around and other people seem to be having this problem as well. I've tried changing the Bayer settings under "FITS/DDP settings" but it doesn't seem to help. Can anyone offer any advice or alternative software I could use? I'd like to get DSS working as it seems pretty straightforward, but I have no idea why it's trashing the colour in my images. Thanks