Processing and Formatting Effects > Flame FX > Matte Edge > Edges Settings >
Advanced Settings

Minimum Input field
  Displays the lower limit of the luminance values. Pixels with lower values are mapped to black.
Maximum Input field
  Displays the upper limit of the luminance values. Pixels with higher values are mapped to white.
Inner Width field
  Displays the width of the inner edges of the matte.
Outer Width field
  Displays the width of the outer edges of the matte.
Width Proportional button
  Enable to affect the inner and outer width proportionally.
Inner Softness field
  Displays the level of softness on the inner edges of the matte.
Outer Softness field
  Displays the level of softness on the outer edges of the matte.
Softness Proportional button
  Enable to affect the inner and outer softness proportionally.