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How do pixels convert to dpi?

Relationship between pixels and DPI/resolution?

  • For my graphic design portfolio, the application says that the images should have a "resolution no higher than 100 DPI". When I go under properties for each image, it says the DPI is 72, but the pixelage is 4272 x 2848. I don't understand the relationship between pixels, resolution and DPI. In order to have a resolution of 100 DPI, does the pixelage need to be 100x100? How do I change this?

  • Answer:

    No, you don't need to change the pixels to 100x100 in order to have the DPI at 100. 100x100 pixels or a little over 1"x1" would be way too small for a design portfolio piece. It looks like your file size is large enough to where you can increase the DPI and not lose the quality. In Photoshop, go to Image >> Image Size >> The box that pops up should show Pixel Dimensions, Document Size, etc. To change the DPI, uncheck the Resample Image box >> change the Resolution to 100 >> check the Resample Image box again before hitting OK Your Document Size should go from a Width of 59.333" to 42.72" and the Height should go from 39.556" to 28.48" Your file should now have a DPI of 100. If you want your file size to be smaller (not the DPI) just insert the desired width and length into the Document Size box. I'd highly recommend making sure that the Scale Styles and Constrain Proportions are checked. Good luck!

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DPI means nothing UNTIL it gets printed Lets say you need a 2 by 3 inch picture [small I know] for at the side of a small written piece. at 100dpi that means every inch is 100 by 100 pixels. That means only 10.000 pixels! See why 8 Megepixels is enough to print darn big! Fancy prints tend to hang around 200dpi or 300dpi. That means 4 or 9 times smaller images dues to the quad ration. So a 2 x 3 square inch picture would need at 300dpi 90.000 x 2 x 3 = 540.000 pixels. Half e megapixel. really if what you need need to print is fine at 100dpi we are talking relative low quality image printing. The type of next to a piece of text, something for in a paper.. not for a glossy. Glossies ask 300dpi. So really depending on the size it needs printed at you really don't need many megapixels!

Masticina Akicta

DPI = dots per inch 4272 / 72 = 59.3 inches wide 2848 / 72 = 39.5 inches height If you are printing on a 3 colour printer of 300DPI you need 100DPI for every colour dot (because 3 dots are mixed to make the colour) 4272 / 72 / 3 = 19.7 inches wide 2848 / 72 / 3 = 13.1 inches height http://en.wikipedia.org/wiki/Dots_per_inch

san

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