AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2000.01.24 14:27 "focal length tag and 16bits outputs", by David Hasler
2000.01.24 18:23 "Re: focal length tag and 16bits outputs", by Daniel McCoy

2000.01.24 18:23 "Re: focal length tag and 16bits outputs", by Daniel McCoy

- 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