Re: Optimal file resolution for Epson printers
Re: Optimal file resolution for Epson printers
- Subject: Re: Optimal file resolution for Epson printers
- From: David Burren <email@hidden>
- Date: Sat, 15 May 2004 00:48:00 +1000
Paul, the Epson printers lay dots down in patterns denoted by the
resolutions 360/720/1440/2880/(and higher) dpi. That's DOTS per
inch. You send the data to the printer in terms of pixels, and the
printer driver renders each pixel with a number of dots. This is
why tools like Photoshop now talk about pixels/inch instead of
dots/inch.
The native PIXEL resolution of the Epson printer drivers is 360 ppi.
If you send a lower-res (or higher-res) file to the driver it will
be resampled in the driver to this resolution. I believe this figure
of 360 applies to all of Epson's printers.
So the theoretically optimal resolution of an Epson printer is 360
ppi. But you can typically send it lower-res images and it will
do a good job of resampling. Especially if the resampling ratio
is simple. For example, 240 ppi only requires a 2:3 resampling
(well, 4:9 in 2D), but 250 ppi isn't quite so clean. Depending on
your image you may be able to get away with 180 ppi (1:2 linearly,
1->4 pixels in 2D).
Specifying different resolutions in the driver control panel only
affects the ink density/layout, not the pixel resolution.
As for printing 16-bit images, I think you'll find that it all gets
sampled down to 8-bit numbers in the printer driver.
Cheers
__
David Burren
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