Deconvolution strategies

[Jim_]

I have a quick question...when I take my reading off the DPSF, sometimes it shows my Rotation value as a negative number.
Since I'm still VERY new to the software and haven't figured out how it works yet, would I put the number in as a positive number or would I need to subtract it from either 90 or 180?

Jim

[pfile]

just uncheck "use signed angles" in the DynamicPSF process and you'll get angles you can use.

then again you can generate an average, synthetic PSF from the DynamicPSF tool and use that image directly in the Deconvolution process (as "external PSF"), so you shouldn't have to re-type anything into the Deconvolution processes' PSF generator.

[Jim_]

just uncheck "use signed angles" in the DynamicPSF process and you'll get angles you can use.

then again you can generate an average, synthetic PSF from the DynamicPSF tool and use that image directly in the Deconvolution process (as "external PSF"), so you shouldn't have to re-type anything into the Deconvolution processes' PSF generator.

Thanks pfile.
I'm playing around with both settings.
So far, when I use the synthetic PSF I get a pretty bad rings.
That's half the fun of it though...playing around with it.

Jim

[pfile]

here's what i've found - my PSF/FHWM usually differs quite a bit between my G/B channels and my R channel. i don't know if you are using an OSC or DSLR, but if you are, try extracting each channel separately and making a different PSF for each, then do 3 separate deconvolutions, one for each channel. you'll almost certainly need to tweak the deringing settings for each channel individually.

[darkownt]

Not sure if this helps but for tweaking synthetic PSFs I have found the following useful.

Massaging a PSF

Once you think you have a synthetic PSF which is the closest to what you need, use the same values and adjust them in the convolution tool.
Click the little square that generates an image of the convolution kernal.  Rename this my_PSF

Create a full image Preview in the my_PSF image.  Set up your deconvolution or restoration to point to the preview image of my_PSF as the PSF.  Select the Preview of the my_PSF and open an adjust curves tool.  Play with the curves to "massage" or mold the PSF.  When you apply it, only the preview changes.

Try the Decon or restoration on your real image (probably a preview so you dont need to undo it). See the results.

As needed select the PSF preview and tweak and apply the Massaged curves on it... and then select your image and try decon again.  Your decon tool will keep pointing at the PSF preview and you can keep massaging it as needed.

Try adjusting low values in the curve to adjust outer areas of the PSF, high values of the curve affect the inner areas of the PSF.

After some practice you should get the hang of how things change when you massage the PSF.

Just an idea.