The Definition of Resolution in Photography
Photography resolution refers to either the film grain, the number of pixels or the dots per inch, depending on the format and photography media. Understand the math behind image resolution with information from a professional photographer in this free video on photography terminology.
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Resolution in photography. The material or the way in which the image is recorded and what that image is recorded on as you get closer and closer and closer to the focus area, becomes a factor in the image. So in film that's the grain of the film. In digital photography it's the number of pixels. Now generally, and it's the amount of information that's there. The number of colors, the amount of focus. All of those things has to do with that resolution. It's been a little confusing because there is dots per inch which you see in printing. And newspapers are 75, 65 lines per inch. A good magazine is probably 150 or 200 lines per inch. A good digital photograph is generally 300 pixels or 300 PPI. And a pixel is essentially a picture element. Like in a half tone, it's a dot. And that makes up your resolution. So 72 DPI or 100 DPI, 90, 60 DPI is the resolution of your screen. That's as sharp or is the greatest resolution that your screen can have. Now your devices that digital cameras have in them can have far, far higher resolution than that. I mean most of your 10 megapixel or 15 megapixel cameras are making multiple megabyte photographs. They photograph at 300 PPI or 300 DPI. However you want to say that. And that's going to give you the best resolution for printing a photo.