Blender : Save all shaders texture images nodes to the disk

images_nodes_to_disk.py

import bpy
from pathlib import Path

out_folder_path = "C:\\temp\\"

for mat in bpy.data.materials:
    tree = mat.node_tree
    if tree:
        for node in tree.nodes:
            if type(node) == bpy.types.ShaderNodeTexImage:
                image = node.image
                if image:
                    fname = Path(image.filepath).parts[-1]
                    out_path = out_folder_path + fname
                    image.save_render(out_path)