Help with Solar (partial Eclipse) Image
Posted: Fri Jul 22, 2022 7:09 pm
Hi all,
this is from the (here in Western Europe partial) solar eclipse of June 10, 2021. Since I don’t have a solar filter for my newton, I captured the data with the finder scope (50/~165). I removed the eyepiece and attached my ASI 120 MC with adhesive tape. I know, that seems pretty ridiculous, but the quality of the small scope is surprisingly good.
FireCapture was used to capture the data and PIPP and AS!3 to create this image (a bit post processed, I don’t remember exactly):
I was quite happy with this image, but lately I saw that ST has a special colour matrix for solar images:
viewtopic.php?p=12647#p12647
And of course I tried it out!
I was absolutely blown away as I saw what ST did with my data! The HDR and the SVDecon modules revealed a lot of structures. Unfortunately I’m not sure if these are real structures? Shouldn’t solar granules be smaller and invisible at this resolution? At least the structures at about 7:00 and 11:00 o’clock are real, they can be seen in other images as well. And some kind of banding is visible ...
What I did in ST:
Open TIFF image from AS!3 as Non-linear sRGB source (Is this right?)
- reverse stretch, activate Tracking
Crop
AutoDev
Wipe - with defaults
AutoDev – final stretch, no ROI, defaults (what about dropping Detector Gamma a bit?)
Contrast – dropped Locality down to 5% (maybe it is better not to use this module?)
HDR
– Context Size 10x10, Shadows Detail Boost up to 70%
- I had no success to get the details/structures to reach the border of the sun – is this due to missing resolution?
Sharp – Structure Size: small, Planetary preset
SVDecon - Planetary preset, played around a lot, but the defaults seem to work best!
Color – Matrix: False Color: Solar, Green Bias Reduce to 1.57, Dark Saturation 2.2, this gives a nice transition from red/orange (border) to yellow (centre of the Sun)
Super Structure – not used, maybe use Saturate preset to adjust colour afterwards?
Noise Reduction – without effect, as expected (?)
I searched the ST forum, but I only found a few hints/threads about solar/lunar/planetary processing and so I would be interested to hear if this is a reasonable processing? Any hints/advice/help would be much appreciated.
(And if anyone has any hints concerning the processing in AS!3 or PIPP (in this special case) I would like to hear them too.)
Thanks!
Best regards, Dietmar.
P.S.: If someone would like to take a look, the TIFF I used as input for ST may be found here:
https://c.web.de/@334960167135216273/oy ... Vd6fPyMRLw
Edit: corrected the type of this solar eclipse: of course it was partial as seen from Europe.
this is from the (here in Western Europe partial) solar eclipse of June 10, 2021. Since I don’t have a solar filter for my newton, I captured the data with the finder scope (50/~165). I removed the eyepiece and attached my ASI 120 MC with adhesive tape. I know, that seems pretty ridiculous, but the quality of the small scope is surprisingly good.
FireCapture was used to capture the data and PIPP and AS!3 to create this image (a bit post processed, I don’t remember exactly):
I was quite happy with this image, but lately I saw that ST has a special colour matrix for solar images:
viewtopic.php?p=12647#p12647
And of course I tried it out!
I was absolutely blown away as I saw what ST did with my data! The HDR and the SVDecon modules revealed a lot of structures. Unfortunately I’m not sure if these are real structures? Shouldn’t solar granules be smaller and invisible at this resolution? At least the structures at about 7:00 and 11:00 o’clock are real, they can be seen in other images as well. And some kind of banding is visible ...
What I did in ST:
Open TIFF image from AS!3 as Non-linear sRGB source (Is this right?)
- reverse stretch, activate Tracking
Crop
AutoDev
Wipe - with defaults
AutoDev – final stretch, no ROI, defaults (what about dropping Detector Gamma a bit?)
Contrast – dropped Locality down to 5% (maybe it is better not to use this module?)
HDR
– Context Size 10x10, Shadows Detail Boost up to 70%
- I had no success to get the details/structures to reach the border of the sun – is this due to missing resolution?
Sharp – Structure Size: small, Planetary preset
SVDecon - Planetary preset, played around a lot, but the defaults seem to work best!
Color – Matrix: False Color: Solar, Green Bias Reduce to 1.57, Dark Saturation 2.2, this gives a nice transition from red/orange (border) to yellow (centre of the Sun)
Super Structure – not used, maybe use Saturate preset to adjust colour afterwards?
Noise Reduction – without effect, as expected (?)
I searched the ST forum, but I only found a few hints/threads about solar/lunar/planetary processing and so I would be interested to hear if this is a reasonable processing? Any hints/advice/help would be much appreciated.
(And if anyone has any hints concerning the processing in AS!3 or PIPP (in this special case) I would like to hear them too.)
Thanks!
Best regards, Dietmar.
P.S.: If someone would like to take a look, the TIFF I used as input for ST may be found here:
https://c.web.de/@334960167135216273/oy ... Vd6fPyMRLw
Edit: corrected the type of this solar eclipse: of course it was partial as seen from Europe.