[Radiance-general] conversion of digital pictures to Radiance?

[Greg Ward]

Hi Barbara,

I don't recommend using the RAW format for Photosphere or hdrgen.  
Since there is no "RAW" standard -- RAW is a maker-specific and 
model-specific(!) format, conversion is necessary before it can be read 
by any other program (with few exceptions).  You only complicate your 
life by using RAW, and some of the exposure information that 
Photosphere and hdrgen need is usually lost in translation to JPEG or 
TIFF.

I'm sorry the manual page for hdrgen is missing from the binaries that 
are currently on the anyhere site -- I'll have to fix that as soon as 
I'm able to get back on there.  (They upgraded their servers and ssh 
isn't working right now.)  I am attaching the HTML documentation for 
hdrgen for your convenience.

If you can gain access to a Mac running OS X, you'll find it much 
easier to create and calibrate HDR images with Photosphere, I bet.

-Greg

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> From: Barbara Matusiak <barbara.matusiak at ark.ntnu.no>
> Date: June 1, 2004 6:44:04 AM PDT
>
> Thanks for the heads up!
>
> I'm in the process of choosing a camera and the Digital Rebel seems to 
> be a fine choice indeed. However I would like some more background 
> info on the file formats. I can't seem to be able to dig up much on 
> what the "raw" format actually contains, I imagine it isn't 
> necessarily the same from camera to camera? Are there parameters to be 
> passed on to the hdr generating software based on the raw format?
>
> I have no support for macosx, so it's between windows and linux, 
> although the hdrgen program looks interesting as it's command line 
> based and easier to enter into batch processing. But I couldn't find 
> any documentation about it and the executable doesn't have any built 
> in help whatsoever. :)
>
> Could I possibly ask you to roughly describe the process of generating 
> hdr images from those taken with the Rebel? Any calibration involved?
>
>
> Barbara