dpi is NOT THE SAME as ppi
Quite frequently, “dots per inch” (dpi) and “pixels per inch” (ppi) are [incorrectly] used interchangeably by people who do not understand the difference between viewing on a monitor (“ppi”) and producing a print on paper or some other substrate (“dpi”).
In essence, you can “touch” dots, but you can only “see” pixels (for example, when rendered electronically on a monitor).
LCD monitors display pictures in millions of pixels, arranged in rows and columns. A pixel on a monitor is a single point in a graphic image. The pixels are placed close together so that they appear connected.
One full pixel actually is a combination of one red, one green, and one blue sub-pixel (“RGB” = Red, Green Blue). Programs such as Photoshop describe images in terms of pixel dimensions.
DPI (Dots per Inch) has nothing to do with your image file. DPI refers to how many drops of ink per square inch are used on paper to print an image. BUT, the sizes available for creating a HIGH QUALITY print are completely dependent on the size of the digital file that you create. Known as output resolution, optimum results for printing process require anywhere from 200 PPI to 300 PPI.
Print Quality and Pixel Dimensions
PPI does not affect the print size of an image; it affects the print QUALITY at a particular size. A 240~360 ppi scan = High quality 1200~2880+ dpi print. For example, a 300ppi scan @ 4″ would produce a high quality 4″ print – but the same high resolution file would produce a low quality 16″ print.
We need to assure that our licensee clients are able to create high quality products from our art. That is why we require professionally made high-resolution files at the dimensions of the original artwork.