[ptx] 16 bit and float image support in nona/hugin

[Pablo d'Angelo]

Hi together,

I'm currently working on adding 16,32 bit and float and double images to
nona/hugin.

I was wondering how an alpha channel look like in these format, and if
somebody uses signed 16/32 bit images etc.

Since I don't have a scanner, or a raw capable camera, I don't have
test images, and I'm interested in how they are encoded excactly (including
detailed information in all tiff tags, etc.).

Could some people provide me with a pair of test images (files on
webservers prefered, or scaled down, < 2 MB, images by email) images in tiff
or pnm format?

Are there other popular formats for HDR images that should be
supported?

ciao
  Pablo