Python中Image对象保存TIFF图像失败，报AttributeError求助

Hey there, let's break down why your save() method is throwing an AttributeError and how to fix it!

The Root Cause #

Looking at your code, the issue is straightforward: you're passing lists to the save() method instead of a string file path. PIL's Image.save() expects the first argument to be a string representing the full file path (including the file extension, ideally), but your path and mask_path variables are lists like ['../data/', '5'] (assuming i-10 equals 5). When PIL tries to work with this list as a path, it throws an AttributeError because lists don't have the attributes it needs to handle file operations.

The Fix #

You need to convert those list paths into proper strings. Here are a few clean ways to do this:

1. Using f-strings (Python 3.6+): This is the most readable approach:

   # Build full string paths with .tiff extension
   path = f'../data/{i-10}.tiff'
   mask_path = f'../data/{i-10}_mask.tiff'
   

2. String concatenation: If you prefer older syntax:

   path = '../data/' + str(i-10) + '.tiff'
   mask_path = '../data/' + str(i-10) + '_mask.tiff'
   

3. Joining the list: If you want to keep using the list structure for some reason:

   path_parts = ['../data/', str(i-10), '.tiff']
   path = ''.join(path_parts)
   
   mask_path_parts = ['../data/', str(i-10), '_mask.tiff']
   mask_path = ''.join(mask_path_parts)
   

Full Corrected Code #

Here's how your code should look after the fix:

from PIL import Image
import os

# Make sure the target directory exists (prevents "file not found" errors)
os.makedirs('../data/', exist_ok=True)

# Build proper string paths
path = f'../data/{i-10}.tiff'
mask_path = f'../data/{i-10}_mask.tiff'

collage = Image.fromarray(collage, 'L')
collage_mask = Image.fromarray(collage_mask, '1')

collage.save(path, 'tiff')
collage_mask.save(mask_path, 'tiff')

Extra Tip: #

Adding os.makedirs('../data/', exist_ok=True) ensures the ../data/ directory exists before trying to save files there. Without this, you might get a FileNotFoundError if the directory hasn't been created yet.

内容的提问来源于stack exchange，提问作者Jonathan