How can I get a transparent pixel from an image

I have an image I just need to check the transparent image , How can I do that ?

Please try this

Code:

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if ( (mouseX >= imageX) && (mouseX < imageX+image.getWidth(this)) && (mouseY >= imageY) && (mouseY < imageY+image.getHeight(this)) )
        {
            int alpha = (image.getRGB(mouseX-imageX, mouseY-imageY) >> 24) & 0xff;                                       
            if (alpha == 0) { result = false; }
            else {result = true; }
        }

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