Technote Details :: I get an image processing error when displaying thumbnails

I get an image processing error when trying to display thumbnails with watermark:

Image processing error. Error applying watermark on image.

This happens because the watermark operation could not finish successfully. There are several reasons why this can happen:

1. You do not have an image library that is capable of the operations required to watermark an image, or the path to the image library is incorrect.
2. The watermark image that you set in the user interface does not exist on the server.
3. The image for which the thumbnail is being created is corrupted.
4. The web server does not have all of the required permissions.

To fix this problem you must check and correct all issues presented above:

1. Open a site page in Dreamweaver, and in the Control Panel > Required server libraries check that you have configured an image library and the correct path. Also check the version of the library on the server, and make sure it is higher than the minimum one here.
2. Upload the watermark image on the server, in the folder specified in the user interface.
3. Check that the image for which you are creating the thumbnail is accessible with a standard picture viewer - the file must not be corrupted.
4. Make sure the web server user has read permissions for the folder where the watermark image is stored, and write permissions on the image folder. If using an external, executable library check that the web server user has execute permissions on the file.