How to manually subtract a dark frame?

Started Jun 3, 2014 | Discussions thread
john Clinch
Veteran MemberPosts: 3,029
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Re: ufraw, rawtherapee
In reply to iansmith, Jun 5, 2014

I've not tried this but should really learn

It suggests here putting the dark frame above the image and then setting the blend mode to difference

You can tune the result with the opacity slider

Is that what you tried?

http://www.takegreatpictures.com/photo-tips/software-tips-and-techniques/dark-frame-subtraction-using-adobe-photoshop-br-by-chris-limone

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