Fill Mode fill

The fill parameter determines how the excess space in an image resized with fit=fill or fit=fillmax should be filled.

Valid values are solid and blur.

fill=solid

Fills the excess space with the solid color specified by the fill-color parameter. If no fill-color is specified, the excess space will be white or transparent, depending on whether the image output format supports transparency.

fill=blur

Fills the excess space with a blurred version of the original image. Behavior of fill=blur is identical to the blur parameter but applied only to the excess space.