Directional Mask Expand (ComfyUI custom node)

Expands a mask along a specified direction, measured clockwise in degrees:

• 0 = up, 90 = right, 180 = down, 270 = left.
• pixels controls how many pixels to extend along that vector.
• If pixels is 0, the mask is returned unchanged.

Separate node for pinch/widen:

• Mask Pinch/Widen: keeps the outer silhouette fixed and adjusts inner gaps by operating inside the mask’s bounding box using directional morphology on the inverted mask.
  • vertical_pinch / vertical_widen: operate horizontally on the gap between left/right sides.
  • horizontal_pinch / horizontal_widen: operate vertically on the gap between top/bottom.
  • taper_amount = pixel amount for the operation; 0 disables the effect.

Installation

1. Place this folder inside ComfyUI/custom_nodes/ (already done here).
2. Install any extra deps if you add them to requirements.txt (none needed by default).
3. Restart or reload ComfyUI custom nodes.

Usage

• Add Directional Mask Expand from the mask category.
  • Inputs: mask, angle_deg (float), pixels (int).
  • Output: expanded MASK.
• Add Mask Pinch/Widen from the mask category.
  • Inputs: mask, taper_amount (int), pinch/widen toggles.
  • Output: reshaped MASK.

Notes

• The node includes IS_CHANGED so it won't re-run when inputs are unchanged.