Message-ID: 200001241823.KAA569422@moomin.pixar.com
To: Tiff <tiff@olympiakos.com>, hasler@lcavsun1.epfl.ch
Subject: Re: focal length tag and 16bits outputs
From: Daniel McCoy <mccoy@pixar.com>
Date: Mon, 24 Jan 2000 10:23:03 -0800 (PST)
Sender: owner-tiff@olympiakos.com


>- is there an inofficial tag for focal length in the tiff format?
 
Not that I know of.

>the only thing I saw was TIFFTAG_PIXAR_FOVCOT that looks similar to a
>focal length, but couldn't find any information of how to use it.

I would recommend that you not use that tag.

FOV is short for "field of view", 
but that tag is intended for a specific use for our rendering software
and any other use for it would likely just cause confusion.

>Focal length is a crucial information used in computer vision
>applications.

If you can't find anyone else doing it, it's easy enough to get your
own private tags.  

Or you could encode it into one of the standard string tags.

>- btw, I hacked the tif_getimage.c file to output 16 bits per sample RGB
>images. if anybody is interested, I can send a copy of the file.

You should feed it back into the distribution,
more and more people are using 16-bit files.

Daniel McCoy    Pixar    mccoy@pixar.com

