Many graphics programs provide a feature that resizes a graphic. An easy way to create a thumbnail image
is to first create and save the full-size image, then use the sizing feature in the graphics program to create
a version of that image that is 25% of the original size. Save the thumbnail version by using a different
name.
Tip
The PNG files for background images must meet the following requirements for proper display on the phone:
•
Full size image - 800 pixels (width) X 480 pixels (height).
•
Thumbnail image - 139 pixels (width) X 109 pixels (height).
If you are using a graphics program that supports a posterize feature for grayscale, set the number of tonal
levels per channel to 16, and the image posterizes to 16 shades of grayscale.
Tip
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
64
Cisco Unified Communications Manager Phone Configuration
Custom Background Images
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