In some of the Photoshop "Extended" versions, there was a function in which one could apply a known measurment to an image and then determine other dimensions in the image. For example, if one were designing a sign for a building and shot a picture of the building with a known 5' doorway, one could use the measure tool (or whatever it was called in that function) to tell Photoshop that the doorway was 5'-0" wide. From there, after you laid in the sign design, and used the measure tool on the sign image, Photoshop would tell you the dimensions of the sign based on the scale you set with the doorway. Now for the big question: One, does that function still exist, and two, if so, where do you find it?
It still exists in photoshop cc under Image>Analysis and Window>Measurement Log
The help hasn't been updated to reflect the new locations on menu in cs6/cc, but the other stuff should be the same.
Thanks! big time!