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Drawing on top of the image


Does anybody have an idea, how to draw (lines) on top of the photo, which I
import?

Exactly what I need is:
image = Import["something.jpg"]
imageData = Import["something.jpg",{"JPEG","GrayLevels"}]

Now I want to "slice" (with line) the image and work with the imageData on
the "cut".
 
The question is, how to display the image together with the slicing line.

Thanks for any hint

Jakub


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