21 replies to this topic

[astroflak88]

Took a long break, back at it since sun getting higher

 

 

 

 

 

[gstrumol]

Very nice!

[Foc]

Nice disk, a bit dark to fully appreciate, as seen from my airport lounge phone screen. If my phone is not misleading me, when returning to postings after a gap, then getting/guessing illumination right for display from ones backlit computer is often a challenge.

[gstrumol]

Nice disk, a bit dark to fully appreciate, as seen from my airport lounge phone screen. If my phone is not misleading me, when returning to postings after a gap, then getting/guessing illumination right for display from ones backlit computer is often a challenge.

If you can click on the image it will take you to his site where there are 2 images. The first is a much brighter image of the same pic.

[Foc]

Not enough wifi signal here for the bigger version at the link to work Gary but I will do as you suggest when I eventually arrive.

[rigel123]

Looks good and I think you can pull the proms out in the positive image by pulling shadows up a bit since they show so well in the inverted image.

[astroflak88]

Looks good and I think you can pull the proms out in the positive image by pulling shadows up a bit since they show so well in the inverted image.

I use IMPPG, how do i do that with the curve feature?

[rigel123]

I use IMPPG, how do i do that with the curve feature?

In that case, you can’t just lift shadows.  You will never have a smooth transition between the surface and the proms but you can develop curves to bring the proms out but there will be a sharp delineation (either dark or bright) depending upon how you put anchor points on the curve.  I think Gary uses a curve that retains a positive image for the surface with bright proms.  I would need to play with some images and do a screen capture to show you what I’m trying to describe.  I think GIMP allows you to play with shadows and highlights but I’m not familiar with that program as I use Photoshop or Pixinsight to play with shadows.

[gstrumol]

Consider this PST image on the left from the 21st:

 

(click to enlarge)

 

It is a composite of 2 different tone curves in iMPPG. First, I create an sinusoidal tone curve that give me bright, white proms with an inverted disk. I save this as the "base". Then I reset the curve and create a 'linear' curve that brings out the detail on the disk in a normal form. After editing it in GIMP, I use the ellipse tool to select the disk only. Both the base image and this selected disk are pasted onto a PPT slide and I size the disk to fit inside, and on top of, the base image over the inverted disk. And viola the image above is created.

 

You could also just go directly from the first part into GIMP and invert everything there, but that will leave you with black proms and more of a "3D" gradient on the disk.

[rigel123]

I use IMPPG, how do i do that with the curve feature?

OK, not the greatest examples but here are some curves you can use, or you can process two separate images and then blend them, but you'll always have a sharp delineation between the disk and the proms, either dark or bright.  None have been processed with any sharpening, etc, just bringing out the proms.

 

Curve for white proms/positive disk

 

Curve for dark proms/positive disk (probably the most frequently used but I'm not a fan of dark proms, jmo)

 

Shadows lifted in Photoshop

[gstrumol]

I call that the "hump" curve. It's the third variant I sometimes use.

[theaberrator]

Hi,

 

I am currently developing a new routine that can be used in the next update of waveSharp that aims at highlighting proms in solar-images. Ive taken the liberty to take the original-posters image (kept the copyright intact) to show how this currently looks. This routine automatically spits the image in foreground/background and allows a special enhancement routine to show details in the fore and/or background. In this image I only have automatically pulled the background section forward.

 

EDIT: This is the documentation of the routine I used to show the proms https://www.aanda.or...aa45345-22.html

 

cheers

Cor

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Edited by theaberrator, 23 April 2025 - 11:14 AM.

[theaberrator]

If anyone is interested I am looking to test-drive images. Unlike this example which was based on the 8bit PNG from this thread I do prefer 16bit unsharpened images. You can PM if you are interested in helping to develop this routine further.

 

Cheers

Cor

[rigel123]

Looks pretty good Cor.  It does exhibit what I see in most actions that attempt to separate proms from the disk getting that stark delineation between the proms and disk along with the typical bleed of dark areas of the proms that are at the base.  I’ll try to remember to shoot some disks in 16 bit to send you as I usually always shoot in 8 bit.  Faster fps and smaller files for animations.

[theaberrator]

Hi warren

 

Thanks up ahead for the files, you do not need to shoot in 8bit. It's the stack that needs to be 16bit.

 

On the edge"effect", this is a balancing act. If you want to see spicules for instance they should be a bit brighter. The current setup of this routine allows blending and dimming.

 

Cheers

Cor

[theaberrator]

This shows a better tuned view

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[rigel123]

That’s better.  How do they look in grayscale?  (Yeah, I’m one of those whose preference is without false color)

[theaberrator]

I still had it up in WaveSharp using the exact same settings and just unticking the colourizer

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[rigel123]

Now you’re talkin’! It also almost hides that stark division between the disk and the proms which would be there anyway in a single stack.

[theaberrator]

This shows a few of the colour-schemes I am using tested for the linearity of luminosity. The image shared was using the afmhot scheme which isnt the most linear of this group.

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[rigel123]

I like the descriptions of the colors.  I have your software, I’ll play with it a bit more.

[theaberrator]

But you dont have the stuff I am developing which is brand-new, if you send a PM we can discuss this without "polluting" a thread.