Screen Pixels

On the surface of a computer monitor, a pixel is a fixed and rigid physical entity that can never change size. The resolution of monitors is set to values like 72 or 96 pixels per inch and that always remains the same.

But keep in mind that these "monitor pixels" are only the tiny dots that create the "image pixels" you see on the screen.

When the screen is displaying a digital image, these "screen pixels" are used to create image pixels that can be almost any size. For example, when one of these screen pixels is used to reproduce one image pixel, the image display in Photoshop reads 100% or "Actual size." When two screen pixels are used to display one image pixel the image shrinks to 50%.

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