java - how to get a region out of an image? -

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lets use black key jpg image layout in java code. there easy way region out of image can use region.contains() ontouchlistener?

i've looked them , there isn't any. ask because im making piano app , regions of images use black/white keys.

rather use image, try rendering piano keys yourself, , check if input in black key regions render, rather using image.

if want use image, define black regions within image hand.

detecting regions in image difficult problem, 1 don't want such simple purpose. if had many images, or had might worth headache presumably don't... don't worry it.


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