Hello. I need to define a mesure in a picture: I took a picture of an object with a ruler and I want to signify to photoshop "this segment = 1 cm". How to do? Thank you!

Hello. I need to define a mesure in a picture: I took a picture of an object with a ruler and I want to signify to photoshop "this segment = 1 cm". How to do? Thank you!

That's a good precaution, norm.  It should be no problem is you have an object on a flat surface next to a ruler. It gets trickier in security camera frames.
Anyway that is one example. Anne can look further into the measuring tools of  Photoshop Extended to see if it helps.
A note on the screen resolution thing. When I calculate the screen resolution, I go into Photoshop > Preferences > Units and Rulers
and enter it here in place of the default 72 ppi.  Then when I use View > Print Size, the on-screen rulers will match a physical ruler.
That's if you wanted to look at the actual printed document size onscreen.
Gene

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