Scaling - Xerox DocuColor 40 Reference Manual

1
1-12 Desktop Color Primer
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 ppi
Raster images prepared for offset printing may need to be at higher resolutions than
needed for proofing on your DocuColor 40 CP. Check with your prepress service
provider and printing vendor for their recommendations on image resolution based on
your job specifications.

Scaling

Ideally, each raster image should be saved at the actual size it will be placed into the
document and at the optimal resolution for the print device. If the image resolution is
correct for the print device, there is no quality advantage to be gained by scaling an
image down to a percentage of its actual size. If you scale a large image down 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 a markedly different sizes in a document, save a separate version of the image at the
correct size for each placement.
If you need to place an image at greater than 100% in a document, remember that the
output image resolution is affected. For example, if you scale a 200 ppi image to
200%, the image is printed at 100 ppi.
200 ppi 300 ppi 400 ppi
Image resolution