A very useful test file Dean!
This is an excellent test to check how your printer handles curves or lines
that are not horizontal or vertical. On my Epson 9000 I've found that I
don't get the artifacts at multiples of 180 (including 45, 90, 180 and 360).
There is no improvement by sending a file higher than 360 even though it is
rated at 720 by 1440.
For most of my work (printing images 11 by 14 and larger), my personal
favorite is 240 dpi which gives good results on our old Epson 3000 but not
on the 9000. On the Epson 9000 my final step in printing (after I have
finished all editing and color corrections) I upsize from 240 to 360 using a
bicubic algorithm in an image editor instead of relying on an apparently
crude nearest neighbor method in the printer.
The results on most images is noticeable whenever there are curves or fine
lines off of horizontal or vertical.
BTW, these tests are based on using the Epson print driver inside of
Photoshop to drive the Epson 9000, not the external RIP. Your results may
vary.
Jack Phipps
Applied Science Fiction
-----Original Message-----
From: Shough, Dean [mailto:[EMAIL PROTECTED]]
Sent: Monday, September 10, 2001 9:44 AM
To: '[EMAIL PROTECTED]'
Subject: RE: filmscanners: ReSize, ReSample or ReScan ?
Here is the pdf file that I created that will test your print driver and see
what it does at various resolutions. Make sure that you do not allow
Acrobat to shrink oversize pages or to expand small pages.
<<Printer ResizeTest.pdf>>
This file prints out the same image at various resolutions ranging from 239
dpi up to 2400 dpi. The image contains slanted, one pixel wide lines, both
black on white and white on black. Sorry, I do not remember who first
posted the basic image with the suggestion to print it at various
resolutions - all I did was to combined the various resolutions into one pdf
file.
When I print the file on either an Alps MD5000 or a couple of different HP
laser printers, only the 300 dpi image prints correctly. All other images
have been resampled. I would be interested in the results with other
printers, especially the Epsons.
