| import os | |
| from pathlib import Path | |
| from PIL import Image | |
| from tqdm import tqdm | |
| # we only consider jpeg artifact, not subsampling | |
| subsampling=0 | |
| target_quailty=[10,20,30,40] | |
| for quality in target_quailty: | |
| Path(f"./X{quality}").mkdir(exist_ok=True) | |
| for file in tqdm(os.listdir(".")): | |
| if file.endswith(".png"): | |
| image_pil=Image.open(file) | |
| image_pil=image_pil.convert("L") | |
| basename=os.path.splitext(file)[0] | |
| for quality in target_quailty: | |
| image_pil.save(f"./X{quality}/{basename}.jpg","jpeg",quality=quality,subsampling=subsampling) |