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Orion nebula using NAFE algorithm


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In Saturday's APOD of the sun (http://apod.nasa.gov/apod/ap141122.html) a new algorithm, NAFE, had been used to reduce the high dynamic range to 8 bits.

It's a new adaptive histogram equalisation algorithm.  The software can be downloaded from http://www.zam.fme.vutbr.cz/~druck/Nafe/Index.htm

I thought I'd give it a try on something I'm more familiar with - the Orion Nebula.  First I had to reduce my 64bit HDR image down to 16bits by applying some strong gamma, since the program will only accept 16 bit files.  Using all the default settings this is what it came up with:

post-19658-0-44159000-1416981559_thumb.j

My main criticism is how much the background noise is amplified - maybe tweaking the settings might deal with this.  Otherwise, I think it has done quite a creditable result with no obvious artefacts.

Large version is here:  http://www.markshelley.co.uk/Astronomy/2014/m42_nafe.jpg

The downloaded software only saves as 8bit, which is a bit of a limitation - I prefer to maintain at least 16bits until the very end of processing.  A different implementation could get around this.

Mark

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