Wednesday, 20 January 2016

DPI - Dot per inch

After understanding what is resolution next is DPI. Well, DPI stands for “dots per inch” or the amount of pixels per inch of an image.In printing, DPI (dots per inch) refers to the output resolution of a printer or image setter, and PPI (pixels per inch) refers to the input resolution of a photograph or image. 

DPI only refers to the printer. Every pixel output is made up of different colored inks (usually 4-6 colors, although many printers use more now). Because of the small number of colors, the printer needs to be able to mix these inks to make up all the colors of the image. So each pixel of the image is created by a series of tiny dots (you could think of them as sub-pixels). Generally, the higher the DPI, the better the tonality of the image, colors should look better and blends between colors should be smoother. You'll also use more ink and the print job will be slower. You might want to try setting your printer to a lower DPI to save ink and speed up the job, see if you notice any difference in quality. The lowest setting where you don't see any loss in quality should be the best one to use.

PPI, this is the number of pixels per inch in your image. This will affect the print size of your photo and will affect the quality of the output. The way that it will affect the quality of the output is that if there are too few pixels per inch, then the pixels will be very large and you will get a very pixelated image (jagged edges, you will actually see individual pixels.)

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