Brightness/Contrast adjustment crashes and close the software

[maulakhan]

Hello,

We have been using anylabeling for doing polygonal image labeling. Our images are grayscale, single channel, 16-bit tiff images created by "tifffile" python library. It works great and its very user friendly. However, we are facing an issue that whenever we try to do brightness/contrast adjustment using the GUI, it crashes and closes the software. On windows, we get this error in the terminal window:

Traceback (most recent call last):
  File "C:\Users\joker\Miniconda3\envs\anylabeling\Lib\site-packages\anylabeling\views\labeling\widgets\brightness_contrast_dialog.py", line 37, in on_new_value
    img = PIL.ImageEnhance.Brightness(img).enhance(brightness)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\joker\Miniconda3\envs\anylabeling\Lib\site-packages\PIL\ImageEnhance.py", line 40, in enhance
    return Image.blend(self.degenerate, self.image, factor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\joker\Miniconda3\envs\anylabeling\Lib\site-packages\PIL\Image.py", line 3540, in blend
    return im1._new(core.blend(im1.im, im2.im, alpha))
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: image has wrong mode

Can you please help us to understand how we can use this function correctly, so that it doesn't crash.

Thank you very much