Here are 2 workflows that contain the node LayerMask: MaskByColor:

1.

Size: 3526 bytes

URL: https://github.com/chflame163/ComfyUI_LayerStyle/blob/b1b7a6ce985d5cdea57e755be53a418b3e96472b/workflow/mask_by_color_example.json

2.

Size: 90562 bytes

URL: https://github.com/chflame163/ComfyUI_LayerStyle/blob/b1b7a6ce985d5cdea57e755be53a418b3e96472b/workflow/layerstyle_all_nodes.json