The iq command line utility can be used (among many other things) to get info on the geometry of an image. (iq -s ...)
Unfortunately iq can only do this for the (native?) image formats tif, eps and jpeg.
For all other image formats supported by XPP (bmp, gif, png. pdf en svg) iq draws a blank and one has to resort to other (non-xpp) utilities to find that information.
(these are the formats that XPP will convert during compose/print and put the result in the .xyconvert folder)

You might wonder why I want to use the iq utility instead of just finding out the size of an image using the px/pa trick and reading the %igwidth and %igdepth?

Well, in my experience it is not uncommon to have a situation that you need to know the size of an image before you compose the division.
Knowing the size of an image, would allow you to decide how you want to call out the image inside the division. Does the image become an inline graphic, does it become a block wide pickup or does it become a page wide pickup or maybe even a full page pickup? You need to know this before you import a document in xpp (as we can not create pickups on the fly during compose)

So it would be very nice if the iq utility (or maybe even a new xpp command line utility - as iq does not give this info in the most user friendly way) could give me the answer for ALL supported graphic formats (even if iq needs to do the same conversion as compose/printing does - I would even consider it to be a bonus if one can use iq to preconvert the images as it would reduce the time the system has to spend in compose - aka using unlicensed versus licensed time)