Dots Per Square Inch.You have potentially heard this term many times before particularly in the context of printing your digital pictures.
DPI is frequently used as a measure of digital photo printing quality while the reality is that DPI is an indicator of the printer quality.
DPI is a physical characteristic of a printer. Each printer prints dots that when put next to one another comprise a photograph.
DPI is the maximum resolution a printer is capable of. DPI is outlined as the amount of dots a printer can print per inch. When printing it is critical to be sure the DPI is higher or equivalent to the amount of pixels per in. in the source photograph. If the DPI is lower the printer may not be ready to absolutely show the high-res photograph.
When the DPI is higher the printer will use multiple dots to represent one photograph pixel. DPI is a fixed number for a given printer.
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Many of us confuse Pixels Per Inch with Dots Per Inch or haven’t heard the term PPI. PPI is a measure of the standard of a print and understanding this term and what the number means will help you establish the right sizes and resolutions for your next digital photograph print.
PPI describes the number of pixels per inch in a photograph. PPI is a result of the quantity of pixels the camera’s sensor supports ( AKA megapixels ) and the dimensions of the photo. To work out a photograph’s PPI simply multiply the page length by its width in inches.
The result’s the amount of square inches on the page. Now divide the amount of pixels the sensor supports by the quantity of square inches. The result’s the quantity of pixels per square.
All that’s left to do is to find the square root of this number.
Following is a table that shows the PPI for diverse page sizes for a five megapixel camera.
page size: 4X6 – 456 PPI
page size: 5X7 – 377 PPI
page size: 8X10 – 250 PPI
page size: 11X14 – 180 PPI
page size: 16X20 – 125 PPI
page size: 20X30 – 91 PPI
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