Quote:
Originally Posted by Bassnut
1 iteration is more than fine. After that it just blows out to hell. Of the 1st 2 pics, the original is far better, the "mapped " version albiet deeper, is awefull. Im not sure this fancy mapping gear is that flash really, is it that special?.
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Fred it's the challenge of doing something different.
I've never heard of type of function being used in processing and there is always the scope for improvement.
Quote:
Originally Posted by strongmanmike
They all still look like Hommer Simpson though
Great bit of tinkering Steve
Mike
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Very imaginative Mike. Homer is very apparent.
Do you see Homer in ink blot tests.
Quote:
Originally Posted by PRejto
Nice image! I think 1 iteration is quite enough - and makes the image pop just the right amount without it looking overcooked.
Peter
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Thanks Peter.
Quote:
Originally Posted by LightningNZ
Thanks Steven. That's a really interesting progression. Is there a way to set the sine cutoff point? The core of the lagoon and two of the "walls" of gas are quite bright compared to everything else in the image (other than the stars) and I've found the burn out very easily - as is seen with this progression.
Anything to preserve the dynamic range in the top part of the histogram.
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Unfortunately working on the maths function won't improve the dynamic range as I can only use a narrow range of values by either by changing the multiplier of the angle in the sine term and/or altering the exponential term. The function needs to map each individual pixel to either zero or a positive value. If the mapped value is negative PixInsight will invert the pixel. When I was developing the function I had some bizarre cases where parts of the image were inverted.
There is a solution however. I have a developed a function where the sine term has been replaced by a -tan function. The image needs to be subjected to an even number of iterations otherwise the image is inverted. The resultant mapped image is a low contrast version that retains the information of the unmapped image.
Merging 6 iterations using this function with 3 iterations of the overcooked version with the original function, and using PixelInsights Local Histogram Equalization seems to do the trick.
The faint nebula in the background is revealed without burning out the Lagoon.
http://members.iinet.net.au/~sjastro...HaS_Tmerge.jpg
Quote:
Originally Posted by White Rabbit
Very nice, the result looks similar to the HDR multiscale Transform module in the Pixinsight.
I like the way it makes the dark nebula pop out more.
Nice work.
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Thanks for your comment.
Quote:
A very nice M8 with sharp details. Nice stretch too
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I must admit as others have mentioned Marc, the number of iterations was a bit excessive.
Clear skies
Steven