Preview Image Or Mask(PreviewImageOrMask)

Description

The Preview Image Or Mask node allows you to inspect an image or a mask directly within the ComfyUI interface. It accepts either an image tensor or a mask tensor as input and displays the visual representation in the node’s preview area. This node produces no output – its sole purpose is intermediate visual feedback during a workflow.

Inputs

• input – The image or mask that you want to preview. Because the type is MULTITYPE, you can connect an output from any node that provides an image (e.g., VAEDecode, LoadImage) or a mask (e.g., LoadMask, compositing nodes). The node will automatically interpret the tensor and display it in the UI.

Outputs

This node has no outputs. It is a terminal node that only provides a visual preview and does not pass data further downstream.

Usage Notes

• Use Preview Image Or Mask as a debugging tool or to visually verify the result of a processing step without adding an extra save or encode node.
• Because the node consumes a single tensor and does not propagate it, insert it into a branch where you want to inspect an intermediate result without affecting the rest of the workflow.
• The preview updates in real time when you queue a prompt, allowing you to see changes at each step.
• Performance tip: Avoid placing many preview nodes in a single workflow if you only need a few checkpoints – each preview renders in the UI, which may become sluggish with a large number of active preview nodes. For final outputs, use dedicated save or display nodes instead.