how i can make a part of image black

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Sneha P S
Sneha P S 2018-5-21
编辑： Image Analyst 2018-5-21
I would like to crop an image that is, make a small block of an encrypted image black. How can i do that?

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Image Analyst
Image Analyst 2018-5-21
编辑：Image Analyst 2018-5-21
First, decrypt it, then set the block to black (zero)
yourImage(row1:row2, column1:column2, :) = 0;
Or crop it
yourImage = yourImage(row1:row2, column1:column2, :);
Then encrypt it again if you need to.

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