Cisco CP-7975G Administration Guide - Page 161
PNG File Requirements for Custom Background Images, for Cisco Unified IP Phone 7975G, 7965G
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Chapter 6 Customizing the Cisco Unified IP Phone Creating Custom Background Images PNG File Requirements for Custom Background Images Each background image requires two PNG files: • Full size image-Version that displays on the on the phone. • Thumbnail image-Version that displays 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 by 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 216 pixels (height). • Thumbnail image-80 pixels (width) X 53 pixels (height). • Color palette: - (for Cisco Unified IP Phone 7971G-GE and 7970G)-Includes up to 12-bit color (4096 colors). You can use more than 12-bit color, but the phone will reduce the color palette to 12-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). - (for Cisco Unified IP Phone 7975G, 7965G, and 7945G)-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. 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. OL-23092-01 Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5 6-5