Many people are inclined to use the terms DPI and PPI interchangeably, but that can be dangerously misleading. Web-to-print templates for print products should be using DPIs and web-to-print templates for banners and other on-screen templates should use PPI.

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If you know the ultimate destination for your web-to-print artwork, you can build the file accordingly — which helps optimize readability, document size,, web-to-print processing time and time during the production cycle.
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Creating a high-resolution image from a low-resolution original is no substitute for starting with high-rez data… no matter how many times you’ve seen it done with spy-satellite photos in the movies.
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