Hi folks. I am imaging with a Altair Astro quad band filter and have had issues with dark subtraction causing negative values and truncating the lights to almost black in PixInsight . See attached. I believe the solution is too add a pedestal offset to the light files. So how do you do this ? Or can it be done in Ekos?
Or if someone outer could tell me is there something else I should be doing to combat by dark files having a higher mean value than my lights. 

Thanks,
Lenny.  

Hi folks. I am imaging with a Altair Astro quad band filter and have had issues with dark subtraction causing negative values and truncating the lights to almost black in PixInsight . See attached. I believe the solution is too add a pedestal offset to the light files. So how do you do this ? Or can it be done in Ekos?
Or if someone outer could tell me is there something else I should be doing to combat by dark files having a higher mean value than my lights. 

Thanks,
Lenny.  Hi folks. I am imaging with a Altair Astro quad band filter and have had issues with dark subtraction causing negative values and truncating the lights to almost black in PixInsight . See attached. I believe the solution is too add a pedestal offset to the light files. So how do you do this ? Or can it be done in Ekos?
Or if someone outer could tell me is there something else I should be doing to combat by dark files having a higher mean value than my lights. 

Thanks,
Lenny.  Hi folks. I am imaging with a Altair Astro quad band filter and have had issues with dark subtraction causing negative values and truncating the lights to almost black in PixInsight . See attached. I believe the solution is too add a pedestal offset to the light files. So how do you do this ? Or can it be done in Ekos?
Or if someone outer could tell me is there something else I should be doing to combat by dark files having a higher mean value than my lights. 

Thanks,
Lenny. 

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