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I'm with you all the way and respect your workflow but just to satisfy my own curiosity:

You are scaling the image so that 1" of 'car' is 72 pixels......right?

(I have no idea what 1:1 means.....1 what to 1 what?)

You need to do this so that the 'print' is the correct size....right?

All you need then is to make sure the image has a resolution of 72ppi to match...to keep the print people happy....right?

That's what my code will do.....although its a bit overkill when Image > Image Size is just as easy.

You could run the code before making measurements but its your scaling of the image prior to taking measurements NOT the resolution that will make a difference.

Its for this reason that I'm confused as to why you need a warning......you should have the document already set up correctly...@72ppi.....(or 85px / 3cm if you prefer), otherwise how can any of your measurements make any sense?

All you need to do then is set the resolution of the image...either by IMAGE > IMAGE Size or my script on the end of yours, prior to saving for printing.

You see my point?....you shouldn't need a warning.

Regards.

MrToM.