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Old 23-10-2015, 12:10 AM
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Shiraz (Ray)
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Shiraz is offline
Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,832
Originally Posted by Rod771 View Post
Must be my Hyperstar flats curse. Or I just keep ballsing it up, Ray. I applied the synthetic flat (downsampled to 1) but it over corrected the vignetting by quite a lot. I tried both the image cal tool and BPP but got the same result.

At work atm, I can attach a reference later today.
Hi again Rod. went back and found some data where I had used a synthetic flat. The summary image shows an original sub, the synthetic flat from DBE and the calibrated sub, all with similar stretch. Not perfect, but the method does the job OK if you don't have flats and need them - but of course it doesn't correct for pixel-scale sensitivity variations.
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Last edited by Shiraz; 23-10-2015 at 07:37 AM.
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