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What is PPI – Pixels Per Inch?
The term PPI will not be used much. Many people confuse PPI with DPI or have by no means heard the term PPI. PPI is a measurement of the standard of a print and understanding this term and what the quantity means can help you establish the appropriate sizes and resolutions in your subsequent digital photo print.
PPI: stands for Pixels per Inch. PPI describes the number of pixels per inch in a photo. PPI is a function of the number of pixels the digital camera's sensor supports (also called megapixels) and the scale of the photo. To calculate a photograph's PPI simply multiply the page length by its width in inches. The result is the variety of square inches on the page. Now divide the variety of pixels the sensor helps by the number of square inches. The result's the variety of pixels per sq. inch. All that's left to do is to seek out the square root of this number. Following is a desk that reveals the PPI for various web page sizes for a 5 megapixel camera.
page measurement 4X6 - 456 PPI
page measurement 5X7 - 377 PPI
page measurement 8X10 - 250 PPI
page measurement 11X14 - 180 PPI
page dimension 16X20 - 125 PPI
page measurement 20X30 - 91 PPI