Add a disabled SaveImageWebsocket custom node.

This node can be used to efficiently get images without saving them to
disk when using ComfyUI as a backend.

custom_nodes/websocket_image_save.py.disabled

+from PIL import Image, ImageOps
+from io import BytesIO
+import numpy as np
+import struct
+import comfy.utils
+import time
+
+#You can use this node to save full size images through the websocket, the
+#images will be sent in exactly the same format as the image previews: as
+#binary images on the websocket with a 8 byte header indicating the type
+#of binary message (first 4 bytes) and the image format (next 4 bytes).
+
+#The reason this node is disabled by default is because there is a small
+#issue when using it with the default ComfyUI web interface: When generating
+#batches only the last image will be shown in the UI.
+
+#Note that no metadata will be put in the images saved with this node.
+
+class SaveImageWebsocket:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required":
+                    {"images": ("IMAGE", ),}
+                }
+
+    RETURN_TYPES = ()
+    FUNCTION = "save_images"
+
+    OUTPUT_NODE = True
+
+    CATEGORY = "image"
+
+    def save_images(self, images):
+        pbar = comfy.utils.ProgressBar(images.shape[0])
+        step = 0
+        for image in images:
+            i = 255. * image.cpu().numpy()
+            img = Image.fromarray(np.clip(i, 0, 255).astype(np.uint8))
+            pbar.update_absolute(step, images.shape[0], ("PNG", img, None))
+            step += 1
+
+        return {}
+
+    def IS_CHANGED(s, images):
+        return time.time()
+
+NODE_CLASS_MAPPINGS = {
+    "SaveImageWebsocket": SaveImageWebsocket,
+}