Reply image size limit. Maximum reply image width and height that may be returned to the client.
The server returns an error if a request would cause a reply image whose width or height is larger than attribute::MaxPix .
Two integer numbers, larger than 0, separated by a comma. Width and height in pixels. May also be set to 0,0 to permit any reply image size with no limitations.
Inherited from default::MaxPix if not defined or if empty.