That’s right, it doesn’t mean a hill of beans until that image is headed for a printer because only a printer can do anything with the resolution measurement. Conversely, the lower the resolution, the more loosely those pixels are packed and the larger the image can be physically-though it loses definition and the print will look extremely undesirable and, well, chunky.īecause our monitors can only display a certain amount of information that our eyeballs/brains can process, resolution matters only to printing devices. The closer the pixels are packed together, the smaller the image will be physically when printed. The way resolution affects an image is thus: For a given number of pixels in the width or height of an image, the higher the resolution, the closer the printer packs those pixels together in order to make a beautifully smooth and sharp print. It’s a measurement used for printing (hence the phrase “of printed length”) and it’s usually stated in pixels per inch (ppi-used when referencing screen images) or dots per inch (dpi-used in printing because printers print dots). Simply put, image resolution is the number of pixels displayed per unit of printed length in an image.
First, let’s chat briefly about resolution in general. We’ll discuss the difference between upsampling-a rather evil practice of increasing the resolution (and thereby the number of pixels) in order to make the image larger than it originally was-and changing the resolution of an image without changing pixel data.
Today we’re going to talk about the relationship between resolution and pixels, and what it means to you.
You’d be shocked at the number of brilliant designers who don’t know how to change an image from 72 dpi to 300 dpi-without turning it into a pile of pixel mush. Possibly one of the most confusing aspects of dealing with digital imagery is resolution-specifically, what it really is and how changing it affects an image.
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