I've printed pics with odd ppi counts, like 467 or 331 on my R2400,
and the results were indistinguishable from a print at 360 ppi, even
using a magnifying glass.
Paul
On Feb 10, 2010, at 8:20 AM, Mat Maessen wrote:
On 2/9/10, Godfrey DiGiorgi <gdigio...@gmail.com> wrote:
My experience with Epson printers is that I can get excellent results
with as low as ~180 ppi for large prints, and that resolution
improvement stops at 360 ppi. Other printers ... may be different.
Size the file such that the output sizing you want falls between 180
and 360 ppi, if you want to fix a resolution. 300 ppi is a good
target, but if it falls within this range without resampling, I'd
just
hand them a full resolution file and let them do the sizing for you.
I'd recommend sticking with either 180 or 360 ppi if printing to an
Epson printer. Every time I've tried a resolution that wasn't a
multiple of 180, I've gotten jagged artifacts in the output from the
resampling. The "native" resolution of the Epson inkjets is the factor
here. Photoshop/Lightroom seem to do a much better job with the
resampling/resizing than the Epson print drivers do.
The photo-based professional printers seem to have native resolutions
of either 300 or 400 DPI, depending on the exact model. I'm sure
someone else can shed more light on the process for them.
-Mat
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