can't save screen: PIL.UnidentifiedImageError: cannot identify image file <_io.BytesIO object at 0x04031C58> #17

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1. B-G-T commented on Nov 1, 2020

   

   B-G-T

   on Nov 1, 2020

   More actions

   The issue seems that in case of 800x480 scopes the PNG file is truncated even if you set DISPLAY_DATA_BYTES to 1152000 (= 800x480x3).
   Adding
   from PIL import ImageFile
ImageFile.LOAD_TRUNCATED_IMAGES = True
   after the block with
   from PIL import Image, ImageOps, ImageEnhance
   in cli.py seems to solve it as a workaround but the real issue is obviously somewhere else and needs to be fixed there.

   👍React with 👍1Reacted by Isara Kunudomchaiwat
2. finger563

   added a commit that references this issue on Apr 24, 2023

   fix pklaus#17

   This issue will close once commit ddcc4b2 is merged into the 'master' branch.

   ddcc4b2
3. ornea commented on Apr 12, 2026

   

   ornea

   on Apr 12, 2026

   Last edited by ornea

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   I have similar issues using ds1054z scope ver 00.04.03.SP2

   from PIL import ImageTk, Image
   ...
   img_data = self.scope.display_data

   img = Image.open(io.BytesIO(img_data)) <- this fails as does saving the file first then trying to

   img = Image.open(filename)

   The workarounds above from B-G-T did not work for me but if I change the following line in init ~line no 627

   self.write(":DISPlay:DATA? ON,OFF,PNG") to self.write(":DISPlay:DATA? ON,OFF,JPEG")

   it fixes my issues

   i can see in history that it was once

   self.write(":DISPlay:DATA? ON,OFF,BMP24")