Adobe Illustrator CC
Specifies the distance from the edge of the shadow where you want any blurring to occur. Illustrator creates a transparent raster object to simulate the blur.
Specifies the percentage of black you want added for the drop shadow. In a CMYK document, a value of 100%, used with a selected object that contains a fill or stroke color other than black, creates a multicolored black shadow. A value of 100% used with a selected object that contains only a black fill or stroke creates a 100% black shadow. A value of 0% creates a drop shadow the color of the selected object.