The solution in Comment #53 did not work for me. I ran the script and my panel background image was replaced with a solid color. Manually selecting the background image did not stretch the image to the panel size. So I still had to resort to my solution in #46, which is to use Gimp to stretch the dimensions of the default background image to the width I select for my panel.
The solution in Comment #53 did not work for me. I ran the script and my panel background image was replaced with a solid color. Manually selecting the background image did not stretch the image to the panel size. So I still had to resort to my solution in #46, which is to use Gimp to stretch the dimensions of the default background image to the width I select for my panel.