Hi Leonardo,

I typically following the Phone administration guide for the particular device when it comes to resizing images and have never had a problem. If you are unable to see the image to select on the IP Phone then you need to ensure three things:-

1.  The images have been re-sized according to the guide, in this case:

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 196 pixels (height).

• Thumbnail image—80 pixels  (width) X 49 pixels (height).

2.  The XML List file and Images have been uploaded to the correct directory on each TFTP server in the cluster:-

•      Desktops/320x196x4/
  

3.  The TFTP Service on each node in cluster has been restarted.

Regards

Allan.

Hope this helps, pls rate helpful posts.