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Message: <blockquote data-quote="Alexis" data-source="post: 667784" data-attributes="member: 16911">Hi res for print is 300 dots per inch.Cameras take photos at 72dpi and need converting to 300dpi.A 6 megapixel image is 2848 x 2136 pixels at 72dpi (or 100cm x 75cm)Converted to high res 300dpi the image is 24 x 18cm.So a 6 megapixel camera will print just smaller than A4 at high res. You could easily up it to spot on A4 with no obvious reduction in quality though.Massive billboards are often 100 or 150dpi and massively increased in size, so they have huge dots close up. As they are looked at from a distance it doesn't matter that they're not high res though.</blockquote>