image scale

[astrodoc71]

Does PI need image scale info for some of these processes to work, e.g. deconvolution? Do you enter it somewhere or does the program obtain it some other way?

[astrodoc71]

Ok. I'll ask the question differently. How do I determine the fwhm for a set of stars in my linear data using this program?
Thanks

[bitli]

Using DynamicPSF.

It is even documented ! (click the page like icon at the bottom right of the dialog of DynamicPSF)

-- bitli

[astrodoc71]

Thanks. If you go to image scale >scale mode >literal value you can enter the image scale in arc sec/ pixel. That was my original question!

[astrodoc71]

So now I have another question. Does entering known image scale information lead to a more precise synthetic PSF?

[Juan Conejero]

Does entering known image scale information lead to a more precise synthetic PSF?

Not at all. The image scale is only used to output PSF dimensions in arc seconds. The actual PSF fitting process works on the pixel data, so the image scale is irrelevant.

[astrodoc71]

Ok great! Thanks.