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Date: Fri, 5 Nov 2004 08:30:20 -0600 (CST)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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To: Sachin Garg <schngrg@gmail.com>
Subject: Re: [Tiff] Support for DNG tags
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On Fri, 5 Nov 2004, Sachin Garg wrote:

> On Thu, 04 Nov 2004 08:58:00 -0800, Chris Cox <ccox@adobe.com> wrote:
>> At 5:03 PM +0530 11/4/04, Sachin Garg wrote:
>>> I wish to support DNG images in my application and am currently using
>>> libtiff for tiff files. I recall a recent discussion regarding support
>>> of DNG tags in libtiff.
>>>
>>> It will be great if libtiff can support DNG images too. Are there any
>>> plans to add DNG tags to libtiff anytime soon?
>>
>> LibTIFF could read the tags
>
> Yeah, I read that DNG is also TIFF based and libTIFF can support it. I
> am just curious if there are any plans to do so anytime soon.

Libtiff can already be used to support DNG.  Libtiff can include 
updates (tag definitions) to make this more convenient.  I have heard 
discussion among the libtiff developers about supporting DNG tags.

>> But I don't think libTIFF should try to
>> decode (demosaic) the camera RAW data.
>
> I couldnt get what you mean by this. Do mean that libTIFF _should_
> ignore some specific tags?

Raster images are all about pixels.  The camera RAW data requires some 
advanced knowledge and processing before it may be used as normal 
raster pixels.  Even when libtiff "supports" DNG, the vast majority of 
the heavy lifting will be up to the application since libtiff is not 
going to translate the RAW data into pixels.

Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen
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