pdfst <source> <stamp> <output> [options...] # <source> and <output> should be path to a PDF file and <stamp> can be a path of an image.
# Available Options:
-p, --img-pos int # Image position: 1-9 (just like the phone's keyboard layout) (default 1)
-w, --img-w float # Target image width [mm] (can be omitted if height is)
-h, --img-h float # Target image height [mm] (can be omitted if width is)
-x, --offset-x float # Horizontal shift [mm] depending on the image position. (default 10)
-y, --offset-y float # Vertical shift [mm] depending on the image position. (default 10)
-o, --opacity float # Opacity of stamp. Float between 0 to 1 (default 0.8)
-v, --verbose # Display debug information
