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Drawing on top of the image

• To: mathgroup at smc.vnet.net
• Subject: [mg85201] Drawing on top of the image
• From: Šerých Jakub <Serych at panska.cz>
• Date: Fri, 1 Feb 2008 02:21:35 -0500 (EST)

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