96 dpi images shrink when placed

Hi,

Disclaimer: I'm fairly new to InDesign.  Using 5.5 on Windows.

I'm attempting to work with a large number of images that are at a mix of DPIs.  Some are 72, some are 96.

My 72 dpi images place as expected.  My 96 dpi images all place smaller.

I want to place them all without any resizing.  They should appear in the InDesign document exactly as they appear in any other application (Photoshop, etc.)

From the little I can find on this topic, this is apparently impossible.  Apparently, I cannot mix resolutions within a single InDesign doc without having to manually adjust the scaling of one of the image sizes when importing.

But I can't imagine that this is really true.  I want it to "just work."

Any ideas?

Thanks.