Mask (mask)
mask parameter should provide an image source reference that will be used to mask the current layer image or text.
Masks can be previously defined groups.
For example: mask=image or mask=g!group
Overlay (over)
over parameter should provide an image source reference that will be used as an overlay to be combined with the current layer image or text.
Overlays can be previously defined groups.
For example: over=image or over=g!group
Overlay color (overcolr)
overcolr command applies a tint color to the overlay image. The command parameter value should be a valid color reference.
For example: overcolr=ff0000
Overlay blending mode (overblnd)
Overlay blending mode indicates the method by which the overlay image is combined with the underlying layer image.
For example: overblnd=multiply
Supported blending modes:
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