[billdan (Bill)]

Thanks for replying Simon,

Interesting, I always use RGGB in DSS offset 0,0 (your pic 1) and it always works.
In astroart this also works if I debayer one FITS sub as well.

But after stacking in Astroart the matrix has changed and now the green pixels are shown side by side and none of the the offsets match this.

Anyway I tried all the available offsets and it didn't make any difference
still got pink stars.

EDIT: Are you saying I should do the color synthesis during the stacking process?, I always did it later, I'll give that a go and report back.

I hope I can solve the problem beacuse it stacks much faster than DSS.

I was going to evaluate Pixinsight but I only have 2Gb of ram and I believe it is very memory hungry.

Thanks
Bill