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This is a question that I don't believe has one answer. If you use the full printer resolution, the print size will be determined by how many dots per inch (DPI) you have selected. If you select fewer DPI, the print will be larger. The other option is to let the software expand the picture to fill the page or resize the file first using one of several resize methods. Some of these are quite good. The answer lies in the photo content and the amount of detail you expect. There are two things to think about in terms of detail. Is it something like a group photo, where you expect to walk up close and look at individuals or is it a shot of a subject that fills the frame and will be viewed at a distance? The viewing distance is important. A poster sized print at a distance can look as good as a much smaller print held at arms length. An example is a billboard. You can get into deep calculations and discussions regarding circle of confusion (COC), but I suggest experimenting. To save paper, take a quarter of the photo (select a key part) and see if it looks satisfactory when printed at 8x10. I should add that you can download excellent sample photos of various sizes to help you.

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Q: How many megapixel should you have to make a 16 x 20 picture?
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