I'm trying to measure some particles and they are in millimeters.
The objects are perpendicular to my camera. Are all the pixel sizes the same for my image or they are different on the edges because of the angle?
Should I multiply pixels on edges with different values compared to those in the center?
In order to calculate this resolution you just use the same formula you would use for the area of any rectangle; multiply the length by the height. For example, if you have a photo that has 4,500 pixels on the horizontal side, and 3,000 on the vertical size it gives you a total of 13,500,000. https://digital-photography-school.com/understand-pixels-resolution-resize-photoshop/
Check http://preservationtutorial.library.cornell.edu/tutorial/intro/intro-03.html
https://www.youtube.com/watch?v=KuH0ZLSd_vQ
Regards
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