When publishing to a journal, they always have specifications about the dots per inch (DPI) of your images, and every time I find myself thinking -how do I find out what DPI it's already at, and how do I change it if its not right?
So I am just going to post the link to the blog post I always go back to, which advocates use of freeware IrFanView which has easy ways of checking dpi and changing it, if you are not privvy to more expensive softwares such as photoshop.
Advice and directions can be found here.
http://susanwiggs.wordpress.com/2007/09/06/we-need-a-300dpi-photo/
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