Image resolution and print size

The following screencast uses Photoshop, but whatever image editor you use, the concepts are the same:

(1) There is an inverse relationship between print size and resolution (if you increase the print size the resolution decreases and vice-versa).

(2) To get good results when inserting an image into a research poster, the image should be printed at a resolution of at least 200 pixels per inch (ppi).

(3) Images that look good online may not be high enough resolution to look good in print at the size you want them to be.  For example, an image of 640 by 480 pixels may look fine on your computer screen, but printed at 200 ppi it would only be 3.2 by 2.4 inches in size.

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