2012.07.04 14:33 "Re: [Tiff] How to set the "physical size" of an image when writing a Tiff file?", by Olivier Paquet

On Wed, Jul 4, 2012 at 8:36 AM, Simon Ochsenreither <simon.ochsenreither@kit.edu> wrote:

I have received some Tiff image stacks and I encountered issues

processing them. It seems the values for the "whole" tiff file are set

correctly, but it seems that each individual file is missing the

"physical size" attributes:

There is no "physical size" tag that I'm aware of. What TIFF files store is the size in pixels as well as the resolution in pixels/"some unit". The physical size can be computed from these values. What you're using to view the tags obviously does some interpretation so I can't tell exactly what is missing (the output of tiffinfo would be more useful). It looks like some or all of these tags are missing or invalid for the images:

TIFFTAG_XRESOLUTION
TIFFTAG_YRESOLUTION
TIFFTAG_RESOLUTIONUNIT

Olivier