From the Epson Complete Guide to Digital Printing :
"I'm going to give you one number to remember: 300. This number will always give you the best quality from your Epson printer, regardless of the printer resolution."
Don't confuse the Image resolution with the Print Quality settings. Image resolution refers to the actual pixels in the photograph. Printer resolution refers to the way the printer puts ink down on the paper. If set that way, the printer will print the image at 1440 dpi (for example), regardless of the image resolution.
So, based on this info, a 4x6 print should be 1200 x 1800 dpi (approx 6MB TIFF file), an 8x10 print should be 2400 x 3000 dpi (21MB or so Tiff file)
If you have a photo at a higher resolution, you are wasting valuable disk space and confusing your printer when it has to decide which of the extra pixels it should discard.
Hope this helps.
Tom
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