help please when i render in daz the the out put is white

rigomrtsfx

hi
i am not sure but after i do a render the any artwork in wide screen or any photo
the out sides of the artwork its white color it use to be black , kind of like wide screen with the black bars when you watch a movie
on top and below of the artwork but it is white color now, i tryed everything in the settings for the jpg

i know i missed the setting some where
thank you for your time

Richard Haseltine

How are you saving your image? Is it the background colour, set from the viewport option menu (the button with lines, in the top-right corner by default) showing where there aren't any models?