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In your first two images your Measurement scale is 1:1.

In your third image your Measurement scale is YOUR scale set by YOUR script.

You cannot compare images using different scales.

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Also, the first two images are completely different sizes!!! They EQUATE to the same document size in linear measurement but of course that means one must have many more pixels in it if the ppi is different....and hence the difference in measurement calculations.

If you set the first two documents to be of the SAME DIMENSIONS in PIXELS then you'll find that resolution has no impact on the calculations.

In essence you've used two different document sizes and two different measurement scales....hardly a fair, (nor accurate), comparison.

Change the scale in the first TWO examples to YOUR scale and THEN do a comparison.

Regards.

MrToM.