A
8-95 Desktop Color Primer
Color Reference Guide for C9800 - 95
Beyond a certain threshold, a higher image resolution greatly increases file size while
having a minimal effect on output quality. The optimal image resolution depends on
the resolution of the final print device. Aim for the resolution that optimizes both file
size and output quality.
The resolution of a raster image, along with its bit depth and physical dimensions,
determine its file size. The following table shows the file sizes of color raster images at
different dimensions and resolutions.
In this table, the shaded areas indicate that 200 ppi is typically the best trade-off
between image quality and file size. However, higher resolutions (for example,
250 to 300 ppi) may be necessary for offset printing, when quality is of the utmost
importance, or for images containing sharp diagonal lines.
To find the best image resolution for your purposes, make test prints of some raster
artwork at different resolutions. Start with a high-resolution image (400 ppi) and save
versions at progressively lower resolutions, down to 100 ppi, using a pixel-editing
application, such as Photoshop. Always save a copy of the original high-resolution
version, in case you must revert to it. The high-resolution data cannot be recreated
from a lower resolution version.
File size at
Image size 100 ppi 150 ppi 200 ppi 400 ppi 600 ppi
RGB/CMYK RGB/CMYK RGB/CMYK RGB/CMYK RGB/CMYK
3"
x 4"
0.4/0.5 MB 0.8/1.0 MB 1.4/1.8 MB 5.5/7.3 MB 12.4/16.5 MB
5"
x 7"
1.0/1.3 MB 2.3/3.0 MB 4.0/5.3 MB 16.0/21.4 MB 36.1/48.1 MB
8.5"
x 11"
2.7/3.6 MB 6.0/8.0 MB 10.7/14.3 MB 42.8/57.1 MB 96.4/128.5 MB
11"
x 17"
5.4/7.1 MB 12.0/16.1 MB 21.4/28.5 MB 85.6/114.1 MB 192.7/256.9 MB
To Next Page
Loading...
Need help?
General
