DPI (dots per inch) explained: How many do I need, and what is it anyway?

Filed in:

What is this term DPI (dots per inch), really? It’s a measure of how many dots will be printed per inch.  Keyword: printed. DPI, contrary to many ideas around it, does absolutely nothing when it’s set in Photoshop for images that are displayed on the web. Take a hypothetical image of 100 x 100 pixels…