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It makes all the difference in the world if your taking a 640x450 pic and putting it into 120x110 thumb table spot. If the size of the image unretouched is ok for the place its going... no prob but you have to specify the h and w when you need to fit it in somewhere. Also, an image or banner may look ok on the page in its default size until you upload and then look at the page in a browser. So the answer is you don't have to specify the size but you usually need to for final page placement anyways. Hope this helps
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