Unpacking HDR and HDRi in Camera Raw

General topics about imaging

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Unpacking HDR and HDRi in Camera Raw

Postby jgaar » Sun Nov 12, 2017 11:46 pm

I just purchased Silverfast and have been trying to utilize it to the projected full potential. It's becoming clear to me that it's incredibly proprietary. Is there a workflow anyone knows in order to unpack 48bit HDR scans in Camera Raw? I don't have Silverfast HDR and would like to keep working in the Adobe suite beyond the initial scan. I've seen in other threads that it's a possibility but no links or discussion of exactly how. I would be very grateful for any pointers, links, or tutorials on a workflow.

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Re: Unpacking HDR and HDRi in Camera Raw

Postby LSI_Ketelhohn » Fri Nov 17, 2017 5:39 pm

Dear user,

HDR RAW files cannot be used with camera raw. Scanners do not produce camera raw data. They directly create RGB data because they use a line sensor. So a raw conversion is neither necessary nor possible.
The HDR(i) RAW files are normal tiff, PSD or JP2 files containing unprocessed RGB data. This data is still in the scanner's device color space, not gamma adjusted and without adjusted white and black points.

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Re: Unpacking HDR and HDRi in Camera Raw

Postby Jossie » Fri Nov 24, 2017 5:29 pm


the HDR files can be processed with e.g. PhotoShop or other colour managed software, provided you apply the gamma-correction and interpret an ICC profile -- either the one embedded in the HDR TIF or one you apply independently. I do that regularly. Since you are talking about 48bit HDR data (and not 64bit HDRi data) the scratch removal seems to be not relevant for you. This is the real "propriety" part, although this is also not strictly propriety, since the IR image can be readily extracted from the TIF file. But there is simply no other software around which can make use of the IR data.



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