Resolution and print size for images

Here is a convenient reference table from http://www.nikonians.org

Resolution & Print Size chart

If you want very high quality you need to print at a resolution of at least 300 pixels per inch (ppi). (Of course, you need to start with a good original image.)

Generally, a resolution of 200 ppi is fine for images to be inserted into posters that will be presented at conferences. 300 ppi is even better, but not necessary.  A resolution of below 150 probably won’t look very good.

So, for example, if you want to insert a 10″ by 7″ photo into a poster, the image should preferably be at least 2000 by 1300 pixels to look good.

Posted from Diigo.

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