[Vxl-users] How can I avoid the "Pixel formats incompatible" exception?

[Michael R. <mi...@re...>]

Hi VXL users,

I'm new to VXL. I've got some very large images that I'm opening, not in one
go, but via a vxl_image_resource. But I'm having a problem when I try to get
a view on the resource. The problem is that I don't know ahead of time what
kind of image I might be opening. They can be of various formats (e.g.,
TIFF, BMP, JPG, NTF), and various bit depths (e.g., 1x8, 1x16, 3x8, 4x16).
So, for example, if I just naively call:

vil_image_resource_sptr pResource =
vil_load_image_resource(nameAsConstChar);
vil_image_view<vil_rgb<vxl_byte>> iView =
pResource->get_view(100,200,100,200);

on an image with 1x16 bit depth, I get an exception on the second line that
says "Pixel formats incompatible". Is it possible to query the image
resource to get this information? I looked through the documentation and
couldn't find an example or a method on vil_image_resource that would
provide this information. Maybe I missed it.

Any help and/or pointers to documentation would be greatly appreciated.
Thanks in advance!

:) Michael