Xerox Phaser EX7750 Reference Guide

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. 

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