I follow the Cisco document to set the background image on 9951 IP Phone. I created two png files and upload it to TFTP server. I can see the thumbnail image but when I click preview I get this error "Wallpaper cannot be previewed. Incompatible image size."
PNG File Requirements for Custom Background Images
Each background image requires two PNG files:
•Full size image—Version that appears 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—640 pixels (width) X 480 pixels (height).
•Thumbnail image—123 pixels (width) X 111 pixels (height).
I definitely follow that document step by step and made the image exactly as documented. Apparently in the Cisco developer forum there are issues and bugs with the 9951 background image. Not sure if I have run into a bug. It would be nice if someone could replicate this in the lab. The Phone Designer applications could put the image on the phone without any problem.
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