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It does not matter as long as you don't change the pixel count. You'll notice when you increase dpi, the image size will have to decrease in order to maintain the same pixel count. Specifying dpi is important during the final output phase. Let say you have a master tiff file and you want to create a jpg image for web and another one for inkjet printing. You'll have to create two new image files, and that's the time to specify dpi and image size (e.g. 90dpi / 5x7 inch for web, and 300dpi / 8x10 inch for inkjet prints). After you specify the dpi, sharpen the image by using the unsharp mask tool. The level of required sharpening is partially dependent on the dpi setting.
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I attended a seminar conducted by John Shaw and he said he prints almost everything at 240 dpi. I've uploaded several files to Mpix that have been set to 240 dpi and printed them at 10x15. I've been completely satisfied with the results.
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  • 6 months later...

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