[HDR-photo] xmp files

[Ferrell McCollough]

Hi Bernhard,
I enjoyed your excellent work at the links you sent. I haven't done 360 pan 
work so your shot from the sail boat caught my attention. Would you care to 
share the basics of the shot?  I figured spinning, shooting and sailing 
could be a risky combination.

I'll have to check into the D200 AEB. The nikon site made a mistake but my 
preliminary look into it showed it similar to the D2x.

Yes the website for the D70 says "2 to 3 exposures +/-2EV"

I'll see what I can dig up on the exif real world luminance.

Thank you,
Ferrell













----- Original Message ----- 
From: "Bernhard Vogl" <bvogl at gmx.at>
To: "High Dynamic Range Photography" <hdr-photo at hdr-photography.com>; 
<hdr-photo at hdr-photography.com>
Sent: Monday, December 11, 2006 4:12 AM
Subject: Re: [HDR-photo] xmp files


> Hello Ferell,
>
> Just some comments i like to add:
>
>> Some cameras, like Nikon have a max 1EV step when using AEB mode, so in
>> order to use AEB and get a +2EV and a -2EV sequence we need to shoot 5 
>> images
>> [...] Other camera's like Pentax, Fuji and Olympus only allow 3
>> frames at a max of 1EV step (except for the Fuji S3 Pro which allows 2EV
>> steps)
>
> AFAIK, only the 5-shot bracketing on the D200 is limited to 1 EV range, 
> choosing 3 steps should allow more than 1 EV.
> Other cameras can also shoot 2 EV brackets. I personallly know that the 
> older Fuji S2 and D70 can do and i think it's also standard for most other 
> cameras.
>
>> I believe we should always save our original RAW files, especially the 
>> 0EV
>> for that single shot metered exposure of the scene. I think it would be
>> nice but somewhat redundant if the HDR image contained info that the Raw 
>> file
>> has, white balance, ISO, Color Mode, Focal length, lens used, etc. It
>> doesn't change between exposures so it's not critical.
>
> I think there is some use to also store extended image information in the 
> XMP sidecar file, especially if you consider giving away the merged HDR to 
> other people who won't have access to the original files.
>
> Most modern DSLRs store a real-world brightness estimation in their EXIF 
> data. I never cared about this information (until now), but it could be 
> useful to use this information from the anchor image and combine it with 
> the bracketed shots. This would make a good starting point for real-world 
> illumination HDRs.
>
> Best regards
> Bernhard
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