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

[Chris Cox]

At 11:45 AM -0600 9/27/04, Derek Gerstmann wrote:
> Adobe has proposed a new Digital Negative (DNG) File Format:
> http://www.adobe.com/products/dng/main.html
>
> Although their goals are oriented more towards being adopted by the
> digital camera industry, it seems silly to introduce yet another
> proprietary image format (DNG becoming the PDF of digital images).

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



> Wouldn't an open standard such as OpenEXR be a better choice?

Please read the DNG documentation.
http://www.adobe.com/products/dng/pdfs/dng_primer.pdf
http://www.adobe.com/products/dng/pdfs/DNG_primer_manufacturers.pdf


No, OpenEXR is the wrong thing for camera RAW files.

DNG is for camera RAW files (uninterpolated, unprocessed, uncorrected).
OpenEXR is for scene referenced image data (fully defined, probably 
processed, almost certainly corrected).



> Or is it simply impossible to convince camera manufacturer's of the
> advantages?

I really don't think you understand the purpose of RAW files.
RAW has nothing to do with HDR (at least not yet).


Chris