Cisco Cisco StadiumVision Mobile Manuale Di Manutenzione
© 2013 Cisco Systems, Inc. All rights reserved.
Page 25 of 26
PNG File Specifications for Custom IP Phone Background Images
Each phone background image requires two PNG files:
•
Full size image—Version that appears on the phone.
•
Thumbnail image—Version that appears on the Background Images screen from
which users can select an image. Must be 25% of the size of the full size image.
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.
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 specifications for
proper display on the Cisco Unified IP Phone:
proper display on the Cisco Unified IP Phone:
•
Full size image (width x height) in pixels:
-
Cisco IP Phone 7975 — 320 x 216
-
Cisco IP Phone 9971 — 640 x 480
•
Thumbnail image (width x height) in pixels:
-
Cisco IP Phone 7975 — 80 x 53
-
Cisco IP Phone 9971 — 123 x 111
•
Color palette—Includes up to 16-bit color (65535 colors). You can use more than
16-bit color, but the phone will reduce the color palette to 16-bit before
displaying the image. For best results, reduce the color palette of an image to
16-bit when you create a PNG file.
displaying the image. For best results, reduce the color palette of an image to
16-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 40 (40 red X 40 green X 40 blue = 64000 colors). This is as
close as you can posterize to 65535 colors without exceeding the maximum.
specifying the number of tonal levels per color channel, set the number of tonal
levels per channel to 40 (40 red X 40 green X 40 blue = 64000 colors). This is as
close as you can posterize to 65535 colors without exceeding the maximum.
Creating a Custom Background Image for the Cisco Unified IP Phone
For more information, see the “Customizing the IP Phone” section of the Cisco
Unified IP Phone Administration at the following URLs:
Unified IP Phone Administration at the following URLs:
For the Cisco IP Phone 7975:
For the Cisco IP Phone 9971:
Also refer to the Cisco StadiumVision Local Control Areas Design and
Implementation Guide.
Implementation Guide.