3 replies to this topic

[ub0423]

I have been struggling to get a more natural looking earth shine. In my previous versions, the edge was overexposed and not well defined, the surface was tinted blue, it is noisy, and the list goes on until I stumble upon Adam Block's tutorial on his Youtube channel (https://youtu.be/Ayz...TAzxFNLnm9xim_M)

 

I made a couple additional modifications and the final result is quite satisfactory. Here is my workflow:

 

1. Instead of using one group of exposures, I used two - 0.5 sec ISO 400 @ F/5 (group A - edge over exposed) and 0.5 sec ISO 100 @ F/5 (group B - under exposed but the edge was defined).

2. Align and stack both groups separately in photoshop using average;

3. Open both stacked images in PixInsight and follow Adam's tutorial. Use HDRMultiscale Transform to "flatten out" the exposure difference in the edge and center. This is a trial and error process. Try different settings. Here are my outcomes:

Earthshine with good view of the moon surface but the edge is overexposed:

Earthshine with under exposed moon surface and well defined edge:

3. Do a pixel math to average the 2. I did not purchase the noise exterminator, but I found TGVDenoise works quite well. Again, try different settings. I prefer a mildly grainy output. It looks more natural. (not sure why the compressed image showed some yellow artifact. the uncompressed version doesn't have that)

 

Let me know if this process helps.

 

Now I gotta move on to the more challenging task to tease out the loop structure of the corona. Radial blur / Subtract / Multiply can review the structures irradiate from the center well, but not the loops. 

Edited by ub0423, 20 April 2024 - 01:31 AM.

[ub0423]

Here is a new version blending with the natural looking moon.

Attached Thumbnails

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[SM881]

Here is a new version blending with the natural looking moon.

Looks great! I'd really love to learn about your corona rendering technique! I tried many times on with my images and was never able to get that level of details 🤔

Sue

[ub0423]

Hi Sue,

I just used the classic Pellet method with radial blur filter. Here is a pretty detail photoshop tutorial.
https://youtu.be/iwC...Krh4D10U-jbD2gL

I added additional radial blur with zoom option and pixel value =10 to bring out the loop structures. A high pass filter layer to blend with the final image can also enhance the structure details.

Edited by ub0423, 29 April 2024 - 09:42 AM.