use watermark
wat=1
(required) Activates the watermark function
watermark URL
wat_url=X
(required) The URL of the watermark image. Can be URL-encoded
watermark position
wat_gravity=X
X=[north|south][east|west]|center
Defines the position to "anchor" the watermark to
watermark scaling (relative to original watermark size)
wat_scale=X
X=0..100
Watermark image scaling defined in in percent of the watermark dimensions
watermark scaling (relative to output image size)
wat_scale=Xp
X=0..100p
Watermark image scaling defined in in percent of the output image dimensions
watermark padding
wat_pad=X[p][,Y[p]]
X/Y=0..100[p]
Adds padding from the anchoring point in pixels (X) or in percent (Xp)
watermark opacity
wat_opacity=X
X=0..1
Defines watermark opacity