How to substract an image?

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Chen Zhu
Chen Zhu 2017-3-27
编辑： Guillaume 2017-3-27
rgbImage = imread(fullFileName);
I want to only get the top 20% of the image. How can I do it?
For example, for this image
I only want to get
Thanks!

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Guillaume
Guillaume 2017-3-27
编辑：Guillaume 2017-3-27
This is simple matrix indexing:
croppedimage = rgbimage(1:round(size(rgbimage, 1)*0.2), :, :)
Alternatively, use imcrop

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