--image-bg: Note that # may need to be escaped in some shells

as background for transparent image parts and the like.

Accepted values: default, checks, or an XColor

.Pq e.g. Qo black Qc or Qo #428bdd Qc .

Note that some shells treat the hash symbol as a special character, so you

may need to quote or escape it for the XColor code to work.

.

In windowed mode, the default is checks

.Pq a checkered background so transparent image parts are easy to see .