import bpy
import os
 
# Get the objects
objects = bpy.context.selected_objects
 
# Set the base path
base_path = "d:/export"
 
# Iterate over objects
for obj in objects:
    # Check if object has an active material
    if obj.active_material:
        # Get the material
        mat = obj.active_material
        # Check if the material has a node tree
        if mat.node_tree:
            # Iterate over the nodes in the node tree
            for node in mat.node_tree.nodes:
                # Check if the node is a texture node and if its type is "TEX_IMAGE"
                if node.type == 'TEX_IMAGE':
                    # Get the image
                    img = node.image
                    # Check if the image is not None
                    if img:
                        # Get the image size
                        width = img.size[0]
                        height = img.size[1]
                        print(f"original : {width}x{height}")
                        # Check if the image size is larger than 1024x1024
                        if width > 1024 or height > 1024:
                            print("shrinking")
                            # Determine the new size, keeping aspect ratio
                            aspect_ratio = width / height
                            if aspect_ratio > 1:
                                new_width = 1024
                                new_height = int(1024 / aspect_ratio)
                            else:
                                new_width = int(1024 * aspect_ratio)
                                new_height = 1024
                            # Resize the image
                            img.scale(new_width, new_height)
                        # Set the new path
                        new_path = os.path.join(base_path, img.name)
                        # Save the resized image
                        img.save_render(new_path)
                        # Reload the image and assign it to the node
                        img = bpy.data.images.load(new_path)
                        node.image = img
                        print("saving ",new_path)