comfyui-transparent-png-creator

Create transparent PNG images from RGB + mask input with automatic bounding box cropping. Supports mask inversion and flexible image/mask size mismatch handling.

By CountlessSkies·Created 2 months ago·Updated 2 months ago· 0

CountlessSkies/comfyui-transparent-png-creator

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Transparent PNG From Mask

image/process

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ComfyUI Transparent PNG Creator Custom Node

This custom node takes an RGB image and a mask, and returns an RGBA (transparent) image where the masked area remains opaque, and everything else is transparent. It can also automatically crop/trim the output image to the bounding box of the mask.

Node: `Transparent PNG From Mask`

Inputs:

image: The source image (RGB or RGBA).
mask: The mask defining the area to keep (transparency stencil).
trim_to_mask (Boolean, default: False): If enabled, crops the output image and mask to the bounding box of the masked region.
padding (Integer, default: 10): Bounding box padding in pixels.
invert_mask (Boolean, default: False): Inverts the mask before processing.
resize_mode (Option, default: scale_mask_to_image): Configures how to handle size mismatches between the image and the mask:
- scale_mask_to_image: Resizes the mask to match the dimensions of the input image.
- scale_image_to_mask: Resizes the input image to match the dimensions of the mask.
- none: Does not scale. Prints a warning and falls back to scaling the mask to prevent workflow crashes.

Outputs:

image: The resulting RGBA image tensor.
mask: The cropped/adjusted mask tensor.