Does this mean that any element with a gradient result is dithered (in colour??) but the rest is not?
Maybe I should have attached this pic instead, the offset colour rectange corresponds to the the layer with the fx, partly hidden by the door.
Lets say I would have had some colour elements this still would happen. -A bit unpredicable, at least to me.
As far as I know I used colours and not grayscale in the elements. Whatever the cause it is not visible on screen, carries over to the pdf (object based?) but not to a flattened image.
Oh well, I'll throw in an fx on the whole image until I know what I'm doing. :)