🎈LG_ImageSender

Sometimes you can't drag a wire from where an image is made to where it's needed - the graph is too tangled, the two halves run at different times, or you're handing off to a separate workflow entirely. LG_ImageSender is the "throw it over the wall" half of that problem: it writes your images to ComfyUI's temp folder and tells a matching LG_ImageReceiver where to find them, keyed by a link_id. Think of it as a reroute that survives a restart, or a poor-man's image mailbox.

This is one of the value nodes in Comfyui-LG_GroupExecutor, a small LAOGOU-666 utility pack (v1.3.6) with no Python dependencies and no models. The sender/receiver pattern is its answer to the "I need these pixels over there" problem, and unlike the group-execution features, this one doesn't need anything exotic - it's a save-to-temp plus a websocket ping.

How it works

The Python does the heavy lifting: each input image is squeezed to a single frame, merged with its mask (if provided) into an RGBA PNG, and saved to folder_paths.get_temp_directory() with a name like lg_send_1_<timestamp>_0.png. The alpha channel is the mask (inverted), so a full mask becomes opaque and a blank one transparent. Then it fires a websocket event img-send carrying the filenames and your link_id - and the frontend matches that to any LG_ImageReceiver in the loaded graph with the same link_id, auto-filling its image field.

Two flags change behavior:

• accumulate - off by default. Flip it on and every run's images pile up in a list that all gets sent together on the next run, instead of just the current batch. The node's IS_CHANGED returns NaN in accumulate mode, so it always re-runs. This is the "collect over several passes, then ship" mode.
• preview_rgba - on by default. On, the preview shows the RGBA file (with alpha). Off, it writes a separate RGB JPEG preview for display while the alpha file is still what gets sent. The 2025.4.25 changelog in the README is literally about fixing the rgba/rgb preview path, so this toggle has history.

Inputs & outputs

• images (IMAGE) - what you're sending.
• filename_prefix (default lg_send) - base name for the temp files.
• link_id (default 1) - must match the receiver's link_id. This is your channel; pick different IDs for different pairs.
• masks (optional MASK) - becomes the alpha of the sent PNG.
• signal_opt (optional, any type) - passes through unchanged as the output signal, so you can daisy-chain execution.

Output: signal (list). Also an output node, so it shows a preview in the UI.

Install

ComfyUI Manager → "Comfyui-LG_GroupExecutor", or:

cd ComfyUI/custom_nodes
git clone https://github.com/LAOGOU-666/Comfyui-LG_GroupExecutor

Restart. Done - no pip, no models.

Gotchas

• Temp files aren't permanent. This writes to the temp directory, which ComfyUI may clean up. Long-lived handoffs belong in the output folder, not here.
• link_id is everything. Sender and receiver with different IDs just never see each other, and nothing tells you - the receiver sits there empty.
• Needs the browser session. The auto-fill is frontend JS, so a pure API-driven run won't populate the receiver.