I have somehow lost several images out of my iMac library that I need, so I have scanned actual photos of them back into my library but when I go to have 4x6 copies made, they come out not of usable quality. What might the problem be? The scanner I am using is a Canon TS 9020.
You should scan to the highest PIXEL RESOLUTION your scanner can support. Take a run of the mill 24MP camera. That's a camera creating image files of 6000x4000 pixels. If your scanner supported 6000x4000, those scanned images would be the same pixel resolution as using your 24MP camera.
If you want a gold-standard print of a pixel-based image, you need to achieve 300 pixels per inch aka 300 ppi. That is 'printed' inch, so your 4x6inch print is 1200x1800 pixels, or a 2.2MP image file. (1200x1800/1000000=2.16MP).
Any scan setting that reaches 1200x1800 pixels into the resulting JPEGs will create images for 4x6 printing. Ideally, you'll use a larger pixel resolution, say 2000x3000, if you can't get all the way to 4000x6000.
Are you scanning at maximal optical resolution (2400x4800 dpi)?
Thanks. Had not thought about that. Will go back and try again.
Thank you. That did the trick. I don't know why I didn't think of that myself.
Thank you very much for your suggestion. That solved my problem.
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