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Re: [APML] Orion's Sword Reprocessed
>I've reprocessed my M42 image using mainly PixInsight LE. I tried to use all >the different processes it has to offer. I started with the DBE,
Hi Gary
The background looks very nice. =) The overall illumination is very good, and there aren't problems with the stars' brightness.
It might be just a wrong impression, but maybe you put some DBE samples in regions with some faint nebulosities near M42. Did you carefully check that they contain only backgrond pixels? Did you substract the result?
>then Histograms and Curves, then my first attempt at Wavelets followed by a >SGBNR mask.
I would suggest new histograms and curves adjustements after the noise reduction, becouse now you have more avalaible dinamical range.
>I then went to PS for a lasso/curves of the Trapezium area and ended with a >Auto Levels w/ 50% fade. While still a bit rough, it's my best so far...
It is a quite tricky process, but you can generate a mask to isolate the core of M42... Just as a suggestion (I think that it would work...): Extract the luminance and then duplicate it twice. Blur one of the duplicates with wavelets, disabling the first 8 or 16 pixel scales. Substract the result to the other duplicate, without rescaling. Close the first duplicate. Substract the second duplicate to the original image, without rescaling again. If it worked propperly, you have deleted most stars from the image.
Now, use histograms to isolate M42's core and set the propper transparency of the mask. Finally, don't forget to invert the image, so it will allow processes to be applied to the zone you want.
Well, now some suggestions regarding your image's look. It lacks a bit of saturation, specially in the blues. Use Curve's saturation to increase it.
I didn't like very much the look of M42... the outer regions have too much constrast to the inner ones.
Despite my above critics, it is a very good image, and the use of DBE gave it a new look, by far better (more "professional"). Congratulations.
Regards,
Carlos Milovic F.
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Astro & Photo - CMF
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Visita "AstroFoto", el foro de astrofotografía en español
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