Re: [Openexr-devel] Adobe's Digital Negative Format

[Brendan Bolles]

On Sep 27, 2004, at 11:52 AM, Chris Cox wrote:

> 1) DNG is no more proprietary than OpenEXR
> 2) DNG is defining what is already in widespread use in a way that 
> enables exchange of data (as opposed to the current proprietary 
> formats, which are semi-TIFF based).
> 3) DNG is not for document saving or interchange -- it is only trying 
> to set a standard for camera RAW files


And also, isn't the CCD data in 10 or 12-bit integer format?  So all 
the more reason not to use a floating point format like OpenEXR.  RAW's 
not HDR.

I think DNG is to Raw files what OpenEXR is to the other HDR formats.  
A sensible standard to bring order to the current series of 
loosely-standardized image formats.  And like OpenEXR, it's being 
pushed by a company that has had to deal directly with the problem, in 
this case Adobe and their need to separately support every flippin' 
camera format.

The only thing this has to do with OpenEXR is that it will make it 
easier to convert a series of RAW exposures into an HDR image because 
we'll actually be able to read the source images.


I just wish that like OpenEXR, Adobe was going to release a free 
library to deal with the format.  I see things like "Lossless JPEG" 
that could use source code backup.  I also sort of groan at this being 
yet another extension of the TIFF format.


Brendan