Dec 312012

There’s been a lot of buzz about the new CaptureOne 7.02 beta with X-Trans support. When the NDA lifts, I hope to publish an analysis of how it performs. But today I can talk a brand new RAW converter. It’s from Sandy, of Cornerfix and Chromasoft fame. Name? AccuRaw. It’s a no frills RAW converter. Spiritually, I see it as a Mac version of his iOS RAW converter, PhotoRaw. Sandy was kind enough to share 0.9.5 with me and give me permission to discuss the output.

The interface is simple and straightforward. In short, you open to a browser view, pick a RAW file, then edit in a new window. It takes roughly five seconds to initially interpret an X-Pro1 RAW file (about two seconds faster than Adobe Camera RAW). Each setting change takes a few seconds to complete on my quad-core i7 powered MacBook Pro running 10.8. The timings could change (for the worse or better) by the time the software is released.

AccuRaw is interesting for two main reasons:

1. It explicitly aims to produce accurate rendering of color and tone. Many RAW converters, by default, will produce a fairly contrasty and saturated image.

2. It gives you control over multiple sources of artifacts. By default, it shows you maximum resolution. It then allows you to independently reduce chroma (color) and luma (brightness) artifacts – the downside being resolution is reduced. You can also sharpen the chroma and luma channels independently.

Sandy has told me the X-Trans demosaicing is largely complete, so I believe what I show you will be consistent with the final release.

On to the comparisons! Let’s see our two test images from my last X-Trans RAW conversion post (settings for the first four outputs can be found by checking the just-mentioned link). Both AccuRaw outputs have had the black point brought up to make the overall tone similar to the other four outputs. AccuRaw default uses the default settings (with the exception of 40% luma sharpening) and AccuRaw tuned is the same as before except for 60% Chroma Artifact Suppression, 20% Luma Artifact Suppresion, and 20% Post-demosaic Filter.



I’d say the Fuji JPEG still is the best, with Silkypix and AccuRaw following closely behind. Then comes RPP. In last in ACR. You can clearly see how the Chroma artifacts (the colored dots) are removed significantly in the tuned AccuRaw version with only a touch less micro-contrast and resolution. Still, a few remain – the leaf to the right of the ‘w’ in the AccuRaw images is the worst offender in the entire image. The AccuRAW version avoids the “zippering” of the RPP conversion, also.


Next up is the second comparison – the bush scene. This tests the RAW converters even more because this is an iso800 scene. Now noise becomes a confounding factor. Settings as before for the first four. AccuRaw has had the contrast touched up like before. Default settings, with two adjustments – 20% Chroma Artifact Suppression and 60% Chroma Sharpening.


Fuji JPEG is still the best. Good detail, clean shadows, and little noise. Fuji is doing something clever with the noise reduction. However, now I think AccuRaw is a clear number 2. The noise pattern is tighter and the pine needles are less blotchy than SP.

I’m happy that concrete efforts are being made to improve Fuji X-Trans RAW conversion. AccuRaw is a nice step forward. Its conversions, while a touch short of the in-camera JPEGs of the X-Pro1 (and XE-1) is good enough to be, all around, better than the current  X-trans conversion front-runner, SilkyPix. It also has a much less cluttered user interface!

Clearly, there’s a lot more to compare – highlight recovery, tonality, color accuracy……but I won’t be covering that. My quick impression is that the software with its default settings produces highly detailed images with accurate colors (maybe a bit muted in saturation compared to other converters) and low contrast – good for further tweaking. I think this software is best aimed at people who are interested in extracting maximum detail from a select number RAW files. If you are an picky photographer who enjoys tinkering with RAW files, then give this software a look when it comes out.

(If you are interested in getting access to the beta, it looks like Sandy will have more beta slots in the next release in 1-2 weeks. Keep an eye on his blog.)

((I’ve added another little comparison of the RAW software here:‎))


  2 Responses to “Fuji X-Trans RAW conversion – AccuRaw takes a swing”

  1. Hi. Thanks for Your observations. I shoot RAW only and the FUJI X PRO 1/XE 1 system has a lot of potential I think. But as long as the RAW’s cannot match or exceed the image quality of the jpgs. with any software I won’t invest into FUJI X system. I”ll check CAPTURE ONE and see what they come up with. The fact that the ‘RAW support issue’ is taken on more seriously by some companies is a positive development and I will have a close eye on that. Cheers, Hans

  2. I use RPP, Capture One, Photo Ninja and Lightroom on a regular basis and get great results with them all but I’m completely baffled by the results I get in Accuraw. The shadows slider seems to do nothing useful other than making shadows appear washed out, the highlights slider is the same with the tiniest move of the slider turning everything very nasty. It seems impossible to use the sliders to achieve a decent histogram and a properly exposed looking image. I keep going back to it every couple of months thinking I must be doing something wrong! Always ending in the same frustrations. I consider myself pretty proficient processing at the Raw stage but this software just doesn’t seem to work for me. Any ideas? Thanks.

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