The most important numbers in your photograph regarding image resolution are the pixel length dimensions. Does that sound like gibberish, or what?
Upload an image to
picnik.com, it's a simplified online version of Photoshop, and click on the edit tab and then the resize button. You'll see the pixel dimensions of your photograph there.
The sensor in your camera has a pixel dimension. Every photograph your camera makes is this fixed dimension. Think of the grid as a line of single pixels along...
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