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Why can I simply open a low resolution (i.e. 72 dpi) graphic in Photoshop and increase the resolution to 300 dpi if thats what you need?

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Why can I simply open a low resolution (i.e. 72 dpi) graphic in Photoshop and increase the resolution to 300 dpi if thats what you need?

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When an image is scanned at 72 dpi at the outset, the amount of detail and sharpness that is captured at that low resolution is much less than that which is captured at a higher resolution setting such as 300 dpi, increasing the resolution after the scanning stage will not put back detail and sharpness which was not captured in the first place, it’s merely adding more pixels to a poor scan. The image must be rescanned at the higher resolution.

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