7d6e971b_Magick__Magick_Vector_Graphics__Description
[Method] screen [Description] 
The source and destination are complemented and then multiplied and then replace the destination. The resultant color is always at least as light as either of the two constituent colors. Screening any color with white produces white. Screening any color with black leaves the original color unchanged.
ImageMagick: Magick Vector Graphics
Description