.fit files in Affinity

[DougG26]

Hi guys

First post on here

This post relates to opening .fit (or .fits) files in Affinity. I don't know whether this is a bug or not but I've found that it tends to create havoc when I process the image using GraxPert and others, badly clipping the red channel.

If I open a fit file that is the result of an RGB stack in either DSS or Siril (I haven't tried Affinity, although I know it can stack), I get the result shown in Image1 below. As you can see, two adjustment layers have been added, one curves and one levels, both of which have had adjustments applied (you can see the curves adjustment in the image)

If I open a single RAW light frame that's been converted to .fit in Siril (or whatever) the result is different: I get what you see in Image2, but if I hit Apply in the Develop FITS box, those two adjustment layers are inserted. This is what makes me think that this may not be a bug. This seems to be something to do with debayering, but if so adding two adjustment layers to resolve that seems to be a weird solution.

Any advice would be appreciated. Thanks

Doug

[DougG26]

Hi guys. I'm surprised nobody responded to this post.

Am I missing something? 🤔 

[Old Bruce]

16 hours ago, DougG26 said:

Hi guys. I'm surprised nobody responded to this post. 

Astronomy is a bit of niche area of photography. You mention using a couple of software applications I have never heard of before so that makes me think that you are the only person here on these forums with experience of the particular problem.

[DougG26]

 

Thanks for the response 👍

But are fit files astrophotography specific? Maybe they are 🤔 

[walt.farrell]

On 2/15/2025 at 12:19 PM, DougG26 said:

But are fit files astrophotography specific? Maybe they are 🤔 

There may be other uses, but I think they'd are primarily astrophotography. See https://www.photographingspace.com/how-to-use-fits/

And your use certainly seems to be astrophotography