Why do none of the commands in the IMAGE tool bar work?

asked 2019-04-07 17:54:28 +0200

I have converted a batch of MS PowerPoint presentations to LibreOffice Impress. They are mostly pictures. Now I cannot edit any of the images, eg: using Crop merely resizes the images without removing any of the pieces I wish to cut out. I cannot change the Contrast or Brightness of any image - nothing happens if I use these commands. Am I over-looking an important step?

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