8.4.17 - DPI
Applies and reads DPI from the active image. DPI means "Dots Per Inch." DPI sets the relationship between image pixels and real-world space. For instance, when you print an image, if it is 300 DPI, and the image resolution is 900 wide by 1200 high, it (should) print out as a 3 inch by 4 inch picture on the page.
The DPI operator lets you set the horizontal (x) DPI and the vertical (y) DPI individually; but in almost any circumstance, they should be the same. The dialog tries to help you with this by setting the Y DPI whenever you set the X DPI. If you need to set different values, just set X first and then Y.
The DPI operator
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