RGB Alignment

[jpallas19]

Hello all,
I am currently having issues aligning my RGB channels. I have tried to do so many different ways. I register, stack, and calibrate in Pixinsight and each channel stacks great. I then do a STF  and dynamic crop on the three to make sure my frames are the same size. I then do a LRGB combine and it seems like one channel is off. I have even tried doing a Color combine and have the same issue. I first started stacking my frames in CCDStack and noticed the issue. I then moved my stacking,registering and calibrating to Pixinsight thinking that it would correct the problem, but it didn't. Am I doing something wrong?? My images are all binned 1x1. I have looked and many tutorials online and have been following the steps, but its not working. I have tried this on many other files and I have the same issue. I have attached a JPEG of the picture with the STF not applied and you can see where the red doesn't line up. Help please.

[bitli]

I assume that you do calibration, registration (star alignment) and stacking in that order.
Maybe you aligned the channels independently (red with a red master, etc...)? All images must be aligned on the same reference image (likely on the best red you have).  Try to get that right before trying cropping.
-- bitli

[Philip de Louraille]

As far as alignment is concerned, I always align all frames, all channels together. The independent stacking of R, G, and B, I do after.

[jpallas19]

I use the Batchpreprocessing Script to calibrate, register and then stack my images. It spits out the master light files and I then use LRGBcombine to create an RGB image. In the BPP script I select a good red image as the reference image. Where would I select a reference image when combining to make an RGB image??