More Progress!

06/15/2024. The full-disk technique abandoned me again, so I'll work on making that more robust. Just a tidge less scale would be good as long as I can flatfield the sub-frames. Or else I could use a tidge more scale and adopt a six-frame mosaic, though on the face of it that seems like more work.

It's the high-pass filtration mentioned at the end of the previous page that has my attention this time out. All of these images use it at one point or another in their development. Sorry, no with and without comparisons just yet even though the difference is sometimes striking.

Click anything for a closer look.

Offband, while filter heats up.

Same field, on band.

Two panel mosaic (top/bottom)

A very long plasma noodle.

06/23/2024. Another chance to work out what works. A full-disk with four frames failed miserably; adding two more fields and doing a bit of flatfielding worked out nicely. In camera flatfield was two layers of plastic with a defocused Sun. The restult was not hopeless but not great. I flattened each field in post, flattened the assembled mosaic, then went nuts with sharpening and high-pass filtreation. I'm not going to even describe anything in much detail until the process is much more routine than it is now.

More practice with high-pass filtration and various blend modes follows, always with some ImPPG and other sharpening thrown in just for drill.

 

 

Just a few lessons from the day: (1) Believe the histogram. If it tells you you're not over-exposing, you're not over-exposing. And (2) I still don't know how to make a reliably useful flat for widefield solar photography. The best advice I saw on CloudyNights was "try another cereal bag."

 

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