What did you do?

Call ImageGrab.grabclipboard() on Linux running X11 while the clipboard contains text

What did you expect to happen?

Raise all errors (so exception handling can be done)

What actually happened?

First, UnidentifiedImageError is raised which is fine as it can be suppressed by using exception handling.
However a second error happens Error: target image/png not available but instead of being raised it's printed directly to the console, probably since it's what xclip is sending to stdout.

Because of this simply calling ImageGrab.grabclipboard() with text in the clipboard will always print to the console. I'm using Pillow to constantly check the clipboard for new images so this behaviour causes the console to be flooded with error messages.

What are your OS, Python and Pillow versions?

• OS: KDE Neon 5.27 (Ubuntu Jammy)
• Python: 3.10.6
• Pillow: 9.5.0

The following code should print nothing when the clipboard is text but instead prints the error every loop:

import time
from PIL import Image, ImageGrab

print('Reading from clipboard')

img = None
while True:
    try:
        img = ImageGrab.grabclipboard()
    except:
        pass
    else:
        if isinstance(img, Image.Image):
            print("Successful Image Grab")

    time.sleep(1)