Before I ask the question, can I ask that people don't simply point me to a wiki site or other tech-heavy explanation. I need an answer in layman's terms (if indeed the answer can be given as such). When I resize my photos (using GIMP) to 620px wide (the same width as the post area on my tumblr) the XY resolution is set to 72.00 px/in by default. I'm guessing this is a fairly low resolution, but when I up this to 300 px/in the image doesn't come out at 620px (even though that's the size I set). It comes out much smaller. How do I get the size I want but with a higher resolution?