Assuming how big is a photo 4x6 is in megapixels, to achieve a good print you will require 2.2 megapixels. That’s roughly 1200 x 1800 pixels. Visuals Clipping suggests that images over this resolution should be used in flawless 4x6 prints. This requirement is dramatically outdone by the current smartphone photos, where you will be guaranteed of a vibrant and detailed photos once you print to us.
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