Draw Mask On Image (DrawMaskOnImage) - ComfyUI-KJNodes

The Draw Mask On Image node technically receives image and mask tensors and applies color to the masked area using an alpha blending mechanism.

The Draw Mask On Image node is an image processing tool whose core function is to draw a mask onto an input image with a specified color. It supports visualizing mask regions on images, commonly used for checking or previewing mask coverage.

Node Functionality

This node technically receives image and mask tensors and applies color to the masked area using an alpha blending mechanism. It supports multiple color formats, including RGB (e.g., "255, 0, 0"), RGBA (e.g., "255, 0, 0, 128"), and hexadecimal format (e.g., "#FF0000"). The node automatically handles mismatches in dimensions and batch sizes between the image and mask to ensure smooth operation.

Node Parameter Description - Draw Mask On Image

Connection Inputs (Inputs)

Parameter Name	Data Type	Required	Default Value	Value Range/Options	Description
`image`	IMAGE	Yes	-	-	image (input parameter): Receives the original image on which the mask needs to be drawn, in the standard IMAGE type tensor format.
`mask`	MASK	Yes	-	-	mask (input parameter): Receives the mask to be drawn onto the image, in the MASK type tensor format. Its white areas will be colored.

Control Parameters (Parameters)

Parameter Name	Data Type	Required	Default Value	Value Range/Options	Description
`color`	STRING	Yes	0, 0, 0	-	Color as RGB/RGBA values in range 0-255 or 0.0-1.0, separated by commas. Ex: 255, 0, 0, 128
`device`	COMBO	No	cpu	"cpu", "gpu"	-

Output

Parameter Name	Data Type	Description
images	IMAGE	images (output parameter): Outputs a new image with the colored mask overlaid.

Usage Scenarios

In practical applications, this node is often used in image editing or inpainting workflows. For example, after generating a mask to identify an area of an image that needs inpainting, this node can be used to overlay the mask onto the original image with a semi-transparent red color. This allows for intuitive confirmation of whether the target area is accurate before sending the result to an inpainting node for processing.

Notes

Please note that the format of the color string must strictly adhere to the requirements. Values must be separated by commas and should not contain any characters other than spaces; otherwise, parsing errors may occur. Additionally, selecting the "gpu" device can accelerate processing, but it requires ensuring that the runtime environment supports CUDA.

Draw Mask On Image Node Source Code Link

The Draw Mask On Image node is from the ComfyUI-KJNodes node package.

Draw Mask On Image(DrawMaskOnImage)