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It depends on what the photo will be used for. In traditional print, such as newspapers, magazines, brochures, leaflets, catalogues, advertising leaflets, business cards and flyers etc 300dpi is the minimum requirement. In other words, your image needs to be at least 300dpi if it is being printed in one of these types of publications.
If the image is to be used thus, anything lower than 300dpi will appear distorted; the pixels will appear with ragged edges, thus the image will be blurred and the colours appear different to what they should be.
If however you are printing out an image for personal use, then the dpi is not such an issue, but one thing to remember is the higher the ppi/dpi, the better quality printed photograph you will get. I use Photoshop Elements and you can change the image size by going to image> resize> image size and increasing the ppi to 300 (under document size).
Regards
Denise
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