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Say I have an photo that is 2000 x 3000 pixels. I want a large print that is 20 inches by 30 inches. That means it will be 100 PPI.

I’ve been told to upscale my photo before getting it printed. Why?

What do I upscale the photo to precisely? What’s the formula to upscale a photo?

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I’ve been told to upscale my photo before getting it printed

It is a recommendation. You do not have to if you do not want to. The point, in reality, is if you actually know how a 100PPI image looks like.

100PPI means that you have a little square of 1/100 of an inch. You might see them or not, depending on the viewing distance and the print quality. But also on the detail of the image. You normally see these pixels on a diagonal sharp line. They will look like a saw.

Upscaling it to the exact double, will give you 200PPI, which is normally enough even for close distance viewing. It will diffuse the pixels, which normally is less distracting than seeing the saw line.

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    If you don't, you'll force the print house to do the upscaling. They might not use the method or level of care you expect. Jan 7 at 18:32

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