All About Polar Fringe

Polar Fringe is an analog chroma key generator with a continuously variable soft edge surrounding its location the colorspace. With wide bandwidth voltage control over all four parameters, it’s hard to draw the line hard line between chroma keyer, a complex 2D processor, or even a de-colorizer. Welcome to the fringe.


  • Width, 16HP
  • Mounting Depth, 36mm
  • Power +12V @ 125mA
  • Power -12V @ 130mA

User Reference

Patching Tips

    Set all controls and switches to the default settings shown on
    the frontpanel illustration to the left.
    Patch your RGB image source into the source inputs. Patch the
    RGB Thru outputs to your compositor module’s RGB inputs
    (such as Visual Cortex or Marble Index.)
    Next, patch one of the Key outputs to the voltage control input
    on your compositor module (Visual Cortex or Marble Index.)
    Now you can use the joystick, Diameter, and Fringe controls to
    change the color and quality of the resulting key.
  • Try thinking outside the box with how you include it in a patch – for example, feeding ramp signals or horizontal and vertical waveshapes into the RGB inputs will transform it into a capable shape and pattern generator!


Other Resources