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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
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Chapter6 Customizing the Cisco Unified IP Phone
Creating Custom Background Images
Tip Many graphics programs provide a feature that will resize 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 using a different name.
The PNG files for background images must meet the following requirements for
proper display on the Cisco Unified IP Phone:
•Full size image—320 pixels (width) X 212 pixels (height).
•Thumbnail image—80 pixels (width) X 53 pixels (height).
•Color palette—Includes up to 12-bit color (4096 colors). You can use more
than 12-bit color, but the phone will reduce the color palette to12-bit before
displaying the image. For best results, reduce the color palette of an image to
12-bit when you create a PNG file.
Tip If you are using a graphics program that supports a posterize feature for
specifying the number of tonal levels per color channel, set the number of
tonal levels per channel to 16 (16 red X 16 green X 16 blue = 4096 colors).
Configuring a Custom Background Image
To create custom background images for the CiscoUnified IP Phone, follow
these steps:
Procedure
Step1 Create two PNG files for each image (a full size version and a thumbnail version).
Ensure the PNG files comply with the format guidelines that are listed in the
“PNG File Requirements for Custom Background Images” section on page6-6.
Step2 Place the new PNG files that you created in the folder on the TFTP server for each
Cisco Unified CallManager in the cluster. For more information, see the
“Software Upgrades” chapter in the Cisco IP Telephony Platform Administration
Guide.