In a 72-DPI resolution image, one point is equal to one pixel. Points: A point is a unit of measurement common in typography that is equivalent to 1/72nd of an inch.Inches, Centimeters, Millimeters: These are standard measurement sizes that only apply when an image is printed, and they are related to the image’s DPI.
Pixels: This lets you specify exact pixel dimensions for the resulting image size.For example, using 50% as the target image size makes the image half of its current size. Percent: This lets you resize by a percent of the current image size.
If you click the drop-down menu beside the “Width” or “Height” fields, you can choose the unit type. In the “Image Size” window, first, you’ll want to decide what measurement unit you’ll use to resize the image.
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