Find all textures in the maya scene, and create a low res proxy using Qt

generate_lowres_textures.py

import os
import pymel.core as pm
import json
from PySide2 import QtCore, QtGui

def generate_lowres_textures(output_textures_folder, new_size=1024):
    """
    generate lowres textures from those found in the maya scene
    """
    generated_texture_paths = []
    
    for file_node in pm.ls(type="file"):
        texture_path = file_node.fileTextureName.get()
        
        texture_name = os.path.splitext(os.path.basename(texture_path))[0]
        
        lowres_tex_path = os.path.join(output_textures_folder, "LowRes_{}.png".format(texture_name))
        
        # resave in scaled format
        pixmap = QtGui.QPixmap(texture_path)
        pixmap = pixmap.scaled(new_size, new_size, QtCore.Qt.KeepAspectRatio) 
        pixmap.save(lowres_tex_path)
        
        # apply on file node
        file_node.fileTextureName.set(lowres_tex_path)
        generated_texture_paths.append(lowres_tex_path)

    return generated_texture_paths


generated_texture_paths = generate_lowres_textures(r"D:\SomeRandomFolder\LowResTextures")