1. A method for blending at least a first image with a first light intensity having a first intensity value and a second image with a second light intensity having a second intensity value, which first and second images overlap in a blending area, comprising gradually changing the first light intensity by electronic soft edge means over a first fraction of the blending area, from the first intensity value to a first fraction of the first intensity value, gradually changing the first light intensity by optical soft edge means over a second fraction of the blending area, from the first fraction of the first intensity value to a second fraction of the first intensity value, the first fraction of the blending area being spatially different from the second fraction of the blending area and the first fraction together with the second fraction forming the blending area, gradually changing the second light intensity by optical soft edge means over a third fraction of the blending area, from a first fraction of the second intensity value to a second fraction of the second intensity value, gradually changing the second light intensity by electronic soft edge means over a fourth fraction of the blending area, from the second fraction of the second intensity value to the second intensity value, the third fraction of the blending area being spatially different from the fourth fraction of the blending area and the third fraction together with the fourth fraction forming the blending area.