2004.12.20 20:53 "[Tiff] [ANNOUNCE]: Libtiff 3.7.0 released", by Andrey Kiselev

2004.12.23 18:37 "Re: [Tiff] [ANNOUNCE]: Libtiff 3.7.0 released", by Sachin Garg

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]