Scaling - Oki ES3640eMFP Reference Manual

A
A-107 Optimizing files for processing and printing
original high-resolution version, in case you must revert to it. The
high-resolution data cannot be recreated from a lower resolution
version.
Print the files and examine the output. You will likely begin to see
a marked deterioration in output quality at resolutions below
200 ppi, while above 200 ppi the improvement may be very
subtle.
Image quality
100 200 300 400 500 600
Image resolution
Raster images prepared for offset printing may need to be at
higher resolutions than necessary for proofing on your Fiery.

Scaling

Ideally, each raster image should be saved at the actual size, and
it will be placed in the document at the optimal resolution for the
printer. If the image resolution is correct for the printer, there is
no quality advantage to be gained by scaling an image to a
percentage of its actual size. If you scale a large image to a
percentage of its actual size, you incur unnecessary file transfer
time, because the image data for the entire large image is sent to
the printer. If an image is placed multiple times at markedly
different sizes in a document, save a separate version of the
ES3640e MFP Color Reference Guide - 107