comfyui-ps-normal-layer-composite

ComfyUI PS Normal Layer Composite

A tiny ComfyUI custom node pack for compositing two transparent images like Photoshop's normal layer mode and saving the result as a transparent PNG.

Nodes

• PS Normal Layer Composite (RGBA)

  • Composites top_image over bottom_image using straight-alpha normal blending.
  • Supports top_x, top_y, top_opacity, and multiple canvas sizing modes.
  • Accepts optional ComfyUI MASK inputs for each image's alpha.
  • Outputs RGBA image, RGB preview, alpha mask, and ComfyUI transparency mask.

• Save Transparent PNG (RGBA)

  • Saves an IMAGE with an alpha channel as a real transparent PNG.
  • Can also combine an RGB image with an external alpha/mask input.

Installation

Clone this repo into ComfyUI/custom_nodes:

cd ComfyUI/custom_nodes
git clone https://github.com/Doki21yy/comfyui-ps-normal-layer-composite.git

Restart ComfyUI after installation.

Basic Workflow

1. Load two transparent PNG files with LoadImage.
2. Connect the bottom layer's IMAGE to bottom_image.
3. Connect the top layer's IMAGE to top_image.
4. Connect each LoadImage mask output to bottom_alpha and top_alpha.
5. Keep mask_mode as comfy_transparency_mask for standard ComfyUI masks.
6. Connect rgba_image to Save Transparent PNG (RGBA).

Notes

ComfyUI's built-in IMAGE is often RGB-only, while transparency is passed separately as a MASK. This node supports both RGBA tensors and separate mask inputs, so it works with common image-loading workflows.