[HDR-photo] Re: HDR-photo Digest, Vol 4, Issue 21

[Henk Verhaar]

On 25 Mar 2007, at 19:00, Royce Howland wrote

> In my experience, the interpretation of white balance information  
> varies
> across different RAW converter engines. Photomatix uses an engine  
> called
> dcraw, and I'd expect any other dcraw-based application to convert the
> same file with the same look in terms of WB. Likewise I would expect
> Lightroom and Adobe Camera Raw to look the same since they both use  
> the
> same engine -- ACR. However different RAW converters like Capture One,
> ACR/LR, Aperture, the camera vendor's software, etc. may look  
> different
> than Photomatix (and each other).

Generally speaking, this is not correct. Most, if not all, raw  
converters that use (and acknowledge) dcraw, only use it's decoding  
algorithms to read the different raw formats; they all claim that  
they use their own interpretation algorithms, starting with the  
demosaicing algorithm. AFAIK then, there is no basis for expecting  
that all dcraw-based (or dcraw-using) converters yield similar images...

Henk

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