How can I pre-calculate the "-density 72" and "density 28.34"
with the data I get from identify ?

AFAIK, identify cannot perform this task. I also tried "jhead.exe" which seems to work nicely with IM, but it also gives no information on the xyresolution. You either have to look that value up first (it is shown in almost any Photo editing program) and adjust it manually - or find (or write..) another command line program that provides this information.

Wolfgang Hugemann
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