Is Resolution Important?

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Resolution is one of the most misunderstood and overemphasized components in the printing process. It is not the primary determinant of picture quality… in fact, it really has very little to do with the quality of the final printed (or digital, for that matter) product.
Resolution, at least in this context, is measured in pixels. A pixel is a unit of information. It has no defined size. When we say a picture is 300 PPI (Pixels Per Inch… DPI is a misnomer in the digital world) we are simply saying that we want the pixels scanned to make the file, arranged 300 to the inch. We could just as easily say we want the existing file to be arranged 3000 pixels to the inch. The data would be the same, the resulting print would just be 1/10th the size. The Data in the pixels would be exactly the same!
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Here’s an analogy that might be easier…

Imagine you’re in charge of the coffee bar at a church social or some other soiree. You need enough cups to serve the guests, but it doesn’t matter how many cups you have if the coffee isn’t good.

Pixels are the Cups.

The Coffee is the focus, clarity, amount of noise, density range, color accuracy, and the 100's other factors that determine the quality of the digital photo.