Dpreview studio test shots (including ACR conversions) now published

Started May 7, 2012 | Discussions thread
A Westlake
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Re: Noise Reduction in "RAW" samples
In reply to cs hauser, May 8, 2012

cs hauser wrote:

It's pretty obvious that the high ISO samples have had a large dose of noise reduction applied to it. There are three possibilities here:

  • Fuji is pre-cooking RAW files by directly applying noise reduction to "RAW" files

  • Adobe is secretly applying noise reduction to Fuji RAW files even when NR is explicitly disabled

  • DP Review mistakenly applied noise reduction during conversion

So which is it?

Option 2 is probably closest.

The 'problem' here is simple: the X-Pro1's completely different CFA demands an entirely different demosaicing algorithm compared to conventional Bayer sensors. So direct comparisons are always going to be tricky - you're not quite comparing like with like. It's also entirely possible that Adobe has borrowed the demosaicing algorithm from Fujifilm - producing another, entirely new one would make little sense given everything else they also have to cover (most notably DR modes and lens corrections).

As it happens, SikyPix conversions of these RAWs look very similar to those from ACR - there's remarkably low chroma noise even when all NR sliders are set to zero. (BTW you can confirm that chroma NR was set to 0 in our conversions easily enough, by looking at the file info in Photoshop - 'Advanced' tab, 'Camera Raw Properties'). Basically, the conclusion has to be that RAW conversions from the X-Pro1 just look different to conventional Bayer cameras in ACR, with lower chroma noise, similar to engaging a degree of chroma NR normally.

Overall, it is what it is.

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Andy Westlake
dpreview.com

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