[Insight-users] ITK images to floating-point HDR formats

[Miller, James V (GE, Research)]

Zachary,

Looking at itkTIFFImageIO, it looks like reading 32bit floating point
TIFFs is pretty straight forward.  Do you know where I could find
a floating point TIFF to test against?

Jim

-----Original Message-----
From: insight-users-bounces+millerjv=crd.ge.com at itk.org
[mailto:insight-users-bounces+millerjv=crd.ge.com at itk.org]On Behalf Of
Zachary Pincus
Sent: Saturday, May 06, 2006 3:10 PM
To: Jim Miller
Cc: ITK Users
Subject: Re: [Insight-users] ITK images to floating-point HDR formats


Hi Jim,

For reference, here's Greg Ward's (an HDR imaging originator) page on  
the different HDR formats:
http://www.anyhere.com/gward/hdrenc/hdr_encodings.html .

Basically, the formats are trying to optimize things differently than  
what you'd want for medical or microscopy imaging, including good  
color support, small file size, and perceptual encoding.

Perhaps a good and easy (compared to implementing one of these  
formats) thing that ITK could do would be to support 32-bit floating- 
point TIFF IO. Photoshop CS2 can read these, as can HDRShop, ra_tiff  
(the radiance tool) and probably others. It's not particularly space- 
efficient, but it is something of an interlingua for these different  
formats.

Zach


On May 6, 2006, at 6:24 AM, Jim Miller wrote:

> Zachary,
>
> I am not familar with the HDR formats and tools.  When I looked at  
> the HDR stuff a few years ago, I just re-implemented the reported  
> algorithms :)
>
> If you can some details on these formats, we could consider adding  
> them to ITK.  Our only high dynamic range formats are 16 bit png/ 
> tiff and then the floating point variants of meta, nrrd, analyze 
> (?).  People are introducing new microscope formats which may be 16  
> bits but I suspect they are not higher than that.
>
> Jim
>
> On 5/2/06, Zachary Pincus <zpincus at stanford.edu> wrote: Hi folks,
>
> I'm interested in using some visualization tools developed for
> "HDR" (high dynamic range) images from the computer graphics world.
>
> Unfortunately, the HDR image formats developed by these people, now
> increasingly standard for HDR imaging, are pretty unrelated to the
> formats for medical imaging that have supported high dynamic ranges
> for years.
>
> My question is whether anyone knows any intermediate floating-point
> formats that both ITK and some HDR conversion tool or another can
> read. Right now, I've can write unsigned shorts out from ITK as
> tiffs and can convert them to Radiance HDR formats via ra_tiff; I
> unfortunately can't find an analogous path for floating-point images.
>
> Anyone have any experience/leads/thoughts in this direction? Tools
> for nrrd images perhaps?
>
> Zach
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