Digital BW, The Print

Bob,

Yes, when you send an image at 600ppi to an Epson 1280 printer using the 
Epson driver, your image is upsampled to 720ppi by the driver using Nearest 
Neighbour interpolation (unless the driver has other options such as DCC 
which use a better interpolation). If you sent it an image at 1200 ppi (half 
the size without resampling) it would be downsampled by the driver to 
720ppi. Then the driver would turn the image into dots and print at whatever 
quality(printer resolution) you chose (720,1440,2880, 5760dpi).

Epson mentions these 'input ppi' on page 24 Note 2 of 
http://files.support.epson.com/pdf/pro10a/pro10aps.pdf

Other inkjet manufacturers apparently use different input values.

Bob Frost.


----- Original Message ----- 
From: "B. Campbell" <bellis60@...>



I thought that if I then sent the image to the printer, setting the quality 
in
the printer window at 720, 1440, 2880 or whatever depending on how fine
wanted the size and spacing of each dot to be, my 8x10 image would print at
600 dpi. (and the spacing and size of each of those 600 dpi would be based
on whatever quality I set in the printer window).

But if I understand you correctly you're saying that this is incorrect and
instead of printing at 600 dpi in the above example my 1280 printer will
ignore some setting of mine and instead will always print at 720 ppi (or
dpi?). At what point in the process does this occur (i.e. which of my
settings does the printer ignore and decide for itself that 720 dpi/ppi is
the setting at which it's going to print?).