ComfyUI Node: Preview

Preview:

The 预览 node is designed to enhance the user experience by providing immediate visual feedback during the execution of a node graph. Its primary purpose is to display a preview image as soon as possible, which helps users quickly assess the results of their configurations and adjustments. This node is particularly beneficial in workflows where visual confirmation is crucial, such as in AI art generation or image processing tasks. By prioritizing the execution of output nodes, the 预览 node ensures that users receive timely updates, making the process more intuitive and efficient. This approach not only improves the overall user experience but also aids in faster decision-making and iteration.

Preview Input Parameters:

node_list

The node_list parameter is a collection of node identifiers that the 预览 node will evaluate to determine which node should be executed first. This list is crucial as it dictates the order of execution, with the goal of prioritizing nodes that can provide immediate visual feedback. The parameter does not have a specific minimum or maximum value, as it depends on the number of nodes in the graph. However, it is essential for the list to include valid node identifiers to function correctly.

Preview Output Parameters:

staged_node_id

The staged_node_id is the identifier of the node selected for execution based on the prioritization logic of the 预览 node. This output is significant as it indicates which node will be processed next, ensuring that the user receives the most relevant visual feedback promptly. The value of this parameter is a single node identifier from the input node_list.

Preview Usage Tips:

• To optimize the performance of the 预览 node, ensure that your node graph is structured in a way that allows output nodes to be identified and prioritized easily. This will help in achieving faster visual feedback.
• Regularly update and maintain your node graph to prevent cycles or dependencies that could hinder the effectiveness of the 预览 node in providing timely previews.

Preview Common Errors and Solutions:

Dependency cycle detected

• Explanation: This error occurs when there is a cycle in the node graph, preventing the 预览 node from determining a clear execution path.
• Solution: Review your node graph to identify and break any cycles. Ensure that there is a clear, acyclic path for node execution.

Node does not exist

• Explanation: This error indicates that a node identifier in the node_list does not correspond to an existing node in the graph.
• Solution: Verify that all node identifiers in the node_list are correct and correspond to nodes present in the graph. Update the list to include only valid identifiers.