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Date: Fri, 24 Dec 2004 00:07:03 +0530
From: Sachin Garg <schngrg@gmail.com>
To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
Subject: Re: [Tiff] [ANNOUNCE]: Libtiff 3.7.0 released
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On Thu, 23 Dec 2004 10:28:45 -0600 (CST), Bob Friesenhahn
<bfriesen@simple.dallas.tx.us> wrote:
> On Thu, 23 Dec 2004, Sachin Garg wrote:
> 
> > I am using libtiff in my application for reading-writting tiff files
> > and now wish to extend my app to support DNG images too. I have been
> > waiting for and read about DNG tags added in tiff.h in version 3.7.1
> > :-)
> >
> > However my apps code is based upon that of tools/tiffcp and believe I
> > will have to make same changes in it to support the added tags. I just
> > want to make sure that noone is working on it.
> >
> > btw, a brief on what all needs to be updated in tiffcp will be very
> > helpful, just so that I dont miss something out of ignorance.
> 
> Supporting DNG properly is quite challenging since your application
> would need to understand the camera raw formats.  See
> http://www.cybercom.net/~dcoffin/dcraw/ for ideas.

I have already done this part :-)
 
> DNG requires support for a linear range of bits-per-sample rather than
> the few common ones that tiffcp supports.

I will try to figure this part out. btw, what is the entire possible range?

> The tags themselves are no big deal.

I havent really checked this part. Will adding DNG tag entries in
tiffcp's "cpTag tags[]" array be enough or will I have to do something
non-tivial? (coding handlers for individual tags?)

-- 
Sachin Garg [India]
http://www.geocities.com/schngrg
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