tradesmith45
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Ulysses reacted to a post in a topic:
Solar Eclipse Image Processing w/ Photos
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marcr1230 reacted to a post in a topic:
Solar Eclipse Image Processing w/ Photos
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marcr1230, keep at it. I worked on my images several times to exhaustion & would stop for long periods & come back to them. Took maybe 5 try before I figured out what works. The breaks help refresh you & encourage insight that leads to new progress. I've done lots of astro but nothing comes close to the demands of processing a eclipse @ totality.
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- solar eclipse
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I've learned lots that I can add. Depending on your 18 images, some of Browns recommendations are just plain wrong - namely strong pre-processing adjustments & especially 60+ Clarity. But then he never mentions the need to stay in 32 bit mode. My images (I'm using 77) were shot through light smoke so I have daunting light scatter problems that lead to banding in the sky. Image alignment is probably something you are struggling w/. Of course the lunar disk & sun are not moving together so the lunar disk will be miss aligned when the corona & prominences are aligned. The best tip I have there is use a Levels Adj layer at the top of the stack to increase the contrast in the difference images. When aligning images at different exposures, you need to adjust the Level so that the increased contrast occurs in the overlap region of the difference image. If you have big bright Regulus in your images, you can use that for alignment. OWNER, question for you. Can Photos be set to move images in sub-pixel amounts? PS goes 1 pixel each time the arrow key is tapped. Sometimes sub-pixel alignment is needed w/ these images. Here's the best I've gotten so far out of PS & am about to give Photos a try.
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Got it, thanks. Have gotten to compare my images to others today & the impact of smokey air I had is starting to look like the main cause of the banding artifacts I'm getting. Not sure what do do about that. I'll give a demo version of AP a spin to see if it helps.
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Thanks, this looks promising. I'll go back & look at the radial blur tutorial to make sure that step will do what's needed - blur in the range of 10-20º.
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Thank you. The exposures range from 1/4000 to 4". The pink spots on the moon are caused by lens flare from the red prominences on the solar surface in the long exposures. This particular approach to post processing this mother of all HDR can not reveal the prominences against the super bright inner corona so all that can be seen is the flare. Several additional steps will be needed to tease out the prominences.
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First post here. I've been working on a composite of images captured during totality & getting some banding artifacts in PS when forced to use 16 bit mode rather than 32 bit for sharpening steps. I'd like to make sure Affinity Photos has the adjustments I need in 32 bit mode. The complete workflow for PS is describe in this tutorial by Russell Brown: PS Spin Blur Eclipse Processing From Photos tutorials, I see there are spin-blur filters, Apply Image: Equations panel & an Equations panel. So maybe everything I node is there but done differently in Photos. The key step I'm unsure about is in one of the equations panels. In PS, a duplicate image is spin blurred & the alpha channel of that image is subtracted from the original alpha w/ an off-set of 128 in the Calculations panel to give a low contrast mid-gray frequency mask. That mask is then Overlayed onto the original. I'd like to confirm that all this can be done in Photos in 32 bit mode? Here is a version of my PS work from 77 images w/ artifacts & a mask. The frequency mask reveals the finer corona detail. Thanks!
