Horizontal offset of the shadow from the image. Can be positive or negative.
Vertical offset of the shadow from the image. Can be positive or negative.
In order to create the shadow, the image has to expand with a certain border. This must be wide enough to account for the blurring of the shadow. So it should be larger than the maximum of the horizontal and vertical offset.
Describes how intense should the shadow be blurred. High values will produce a more blurred shadow, but increase processing time a lot.
The colour of the background on which the shadow drops.
The colour of the shadow itself.
Force Background Colour
Makes the background not transparent. This only makes sence for images with transparency (RGBA).