Cannot platesolve processed image

[Forum_2018]

In this image the problem is not platesolve, it's the stars.

If you place the mouse over them you'll see that they are not recognized, because the 8 bit JPEG saturated too much (10 pixels of saturation, there are also small "valleys" in the middle). The Astroart star recognizer is maybe too strict about it. In any case a good precision of the centroid is lost.

About some 16 bit files that where not platesolved, verify again the stars, you may increase the FWHM max in the Preferences. If the stars are really extremely saturated you may try a light Gauss filter, then platesolve, the Undo the filter.

Just as a test, that JPEG image can be platesolved reducing the size of saturation (size of the image), for example with the command Binning2x2. Then the image is correctly platesolved (but the N-E marker is not shown immediately, this is a bug on color images, to solve just Copy and Repaste the platesolved image, or just Save and Reopen it).

[Forum_2018]

Hi Fabio,

Thanks for the explanation.

I tried light gauss blurr, several attempts ranging from 0.1 up to 5 in smalle steps, but with no success.

I am using the full fits file:
http://b-rasmussen.dk/astro/2018/1210/Maffei_ed1.fit

The dip is not present in the fit file image, it must be a JPEG artifact.

[Forum_2018]

Hi,
I see that even after the filter, the bright stars are still not recognized, as can be seen by moving the mouse pointer over them.
It could be the star size or the crossed light streaks, I will use your image to verify.
The problem is not platesolve itself, since it works simply decreasing the size of the image, for example with Binning 2x2.

I'll try fix the star recognizer for these big saturated stars in the next Service Pack, in 2-3 months.
Thanks,
Fabio.

[Forum_2018]

That sounds fabulous Fabio. I am looking forward to that

[Forum_2018]

I have deleted the fit file again. it took up more than 100 MB on the server.
Let me know if you need it again.

[Forum_2018]

I already downloaded it, thanks.

Edit: if after a correct plate solve (e.g. non errors shown) the N-E marker is not shown, then just right click over the image and click the menu to enable "Astrometry". In the other post I wrongly suggested to Copy and Paste the image.