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Re: Image PPI and Epson Printing


The dealer said all
images that are to be printed with an Epson should be at a PPI
divisible into 1440/2880. If the image is at a different PPI (like
300PPI) there will be color shifts because of the conversion to a PPI
that fits into the Epson printing resolutions.

There have been arguments made that to maximize sharpness (and to minimize interpolation error) one should send data to the printer at the native resolution used by the printer driver so that the driver does not need to interpolate the data up or down. Whether this results in significantly improved image quality (or increased throughput) is questionable, but this is likely what your rep was referring to. Your milage may vary.

For what it's worth, from the Epson Product Support Bulletin#: PSB.2004.03.006 (Pro96ups.pdf)

"All Epson large-format printers use 360dpi as the input resolution (this is the resolution that data is rasterized at)..."
and
"As for the Epson desktop products, they rasterize data at 720dpi..."

This used to be significant before Photoshop broke the 30,000 pixel barrier, as it determined the maximum page size. Photoshop CS and CS2 exceed the limitations of the Epson drivers and Photoshop is no longer the limiting factor of maximum page size when using the Epson drivers.

--Rich Wagner

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