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Finding the best input resolution for Printers
The question comes up every so often: "what ppi should I have on my source files?" We were printing some sample prints on our 7600 to send out to people and noticed that the text on the sheets had strange jaggies, plus the photos had nearest neighbor resizing artifacts on the print, but looked perfect on-screen. We finally realized our input resolution (300 ppi) was causing the problem. I created two PDF files to test which is the best resolution, you can find them Here and Here. You can also get the TIFF Files I used to make the PDF files Here and Here.
Inside you'll find different resolution patches designed to test to see what resolution the printer is truly looking for.
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| Alternating lines (this is what it's supposed to look like) | Diagonal lines (this is what it's supposed to look like) | A Morie pattern caused by resizing
the diagonal image |
If you print the files, make sure you use a good glossy paper like the premium glossy photo paper and be sure you aren't selecting the "shrink oversize pages" or "expand small things to fit page or something like that" as these will completely mess up the test.
You'll notice that some resolutions have major resizing artifacts when printed (all look nasty in Acrobat reader), while others get it dead on. We found that 360ppi was perfect for our printer (and likely the rest of Epson's printers), 480 had significant artifacts (some people claim that 480 is the optium resolution for desktop printers) and 180 was also fine. You'll notice I'm talking of ppi or Pixels Per Inch. Even though the 7600 has a Dots Per Inch resolution of 2880x1440, it uses several dots to reconstruct each pixel. All inkjet and laser printers work this way, even offset presses have to use a halftone or scatter screen to make the different colors.
Chris Bair - Webmaster
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