Add a random string to the temp prefix for PreviewImage.

nodes.py

@@ -7,6 +7,7 @@ import hashlib
 import traceback
 import math
 import time
+import random
 
 from PIL import Image, ImageOps
 from PIL.PngImagePlugin import PngInfo
@@ -1116,6 +1117,7 @@ class SaveImage:
     def __init__(self):
         self.output_dir = folder_paths.get_output_directory()
         self.type = "output"
+        self.prefix_append = ""
 
     @classmethod
     def INPUT_TYPES(s):
@@ -1133,6 +1135,7 @@ class SaveImage:
     CATEGORY = "image"
 
     def save_images(self, images, filename_prefix="ComfyUI", prompt=None, extra_pnginfo=None):
+        filename_prefix += self.prefix_append
         full_output_folder, filename, counter, subfolder, filename_prefix = folder_paths.get_save_image_path(filename_prefix, self.output_dir, images[0].shape[1], images[0].shape[0])
         results = list()
         for image in images:
@@ -1160,6 +1163,7 @@ class PreviewImage(SaveImage):
     def __init__(self):
         self.output_dir = folder_paths.get_temp_directory()
         self.type = "temp"
+        self.prefix_append = "_temp_" + ''.join(random.choice("abcdefghijklmnopqrstupvxyz") for x in range(5))
 
     @classmethod
     def INPUT_TYPES(s):