DSP Robotics Support

Weird question, how do I simply make this knob smaller?
Thanks in advance. Cheers

Radius of Marker parameter and change code

v.drawBitmap @image,[(v.width-@image.width)/2.0,(v.height-@image.height)/2.0]
v.drawBitmap @image,[(v.width-@image.width),(v.height-@image.height),2,2]
2,2 bitmap scale

Thanks, The thing I don't understand is the relationship between the marker radius and the bitmap size? Could You offer an explanation to make this slightly clearer please. Kind Regards.