Why resize to 300 ppi before printing?

Started 8 months ago | Discussions thread
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Sheld
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Why resize to 300 ppi before printing?
8 months ago

I can understand cropping, and getting the aspect ratio correct, and sharpening, and raw image processing to get the contrast right. I'll even add borders to get an image with the exact right aspect ratio, rather then letting Costco crop it to 3:2.

But can anyone explain why its better to resize to some exact ppi value, before uploading an image to Costco? They automatically print images at the exact image size anyway. I figure, as long as the image is in the 180 to 400 pixel per inch range, it will look fantastic. For the 20x30's, I can only get 163 pixels per inch from my K30 at 16 megapixels, but that's also good enough for some images. Its hard for me to imagine getting better results if I uprezzed the image to 300pixels per inch first...

- Shel, my photos, http://www.sheltx.com/

Pentax K-30
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