[jase (Jason)]

Thanks Fred. Yes, as I mentioned in a previous post my intention is to combine data from different focal lengths to get the best of both instruments. The output image presented wasn't what I originally intended, but I thought I’d test the data scaling possibilities of the chrominance data. The star halo's are a side effect of the scaling. Normally, I would get the stars from the RGB data, but this was not possible with the scaled data - too much bloating, so I had to mix the lum and RGB to manage the stars. Yes, I did the minimum trick on the stars, but seriously if you had of seen the upscaled RGB data, you'd be horrified. Stars went crazy. At first I thought Registar did it all wrong, so I re-registered everything to no avail. It was at that point I knew I had a real challenge on my hands.

I should make a correction - you can upscale the lum IF you are using the same focal length for the RGB or emission line filters – which is your case. I would seriously not recommend it if using different focal lengths. Regardless of your scaling decision, good data is a requirement to minimise noise.