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First image: it's smaller than the page. Selecting both, image and shape and performing Right click → Shapes → Intersect (5th form function) you'll obtain weird results....
Second image: it's the same than before, but it was enlarged
Now, selecting both, enlarged image and shape and doing Right click → Shapes → Intersect (5th form function) you'll obtain weird results...
Third image: originally larger than the page. Selecting both, picture and shape and doing Right click → Shapes → Intersect (5th form function, in german schneiden) gives same results as with second picture, but now even if you perform over the image a right click → Original size, you will get weird results