Images Display a Black Background

If your imagery displays a black background instead of a transparent background, verify that the imagery has transparency values. For example, you can add an alpha band to the image to specify regions of transparency. Alternatively, if you cannot add transparency values to an image, you can configure Express Server to use black pixels as transparent pixels.

To use black pixels as transparent pixels, complete the following steps:

1. Open the Express Server Manager (see Accessing the Express Server Manager).
2. Click Catalogs on the top navigation bar, then select a catalog in the list.
3. Select Advanced on the left-hand navigation panel, then click Edit.
4. Select the Use black no-data checkbox, then click Save.
5. If you have no further settings to edit, click Publish.