Java BufferedImage how to find out if a pixel is transparent

Question

I am going to use the getRGB method for BufferedImage. I want to check the pixels of the image and see which ones have transparency (in general, the pixels that will be transparent will be completely transparent). How can I get it from an int that returns getRGB?

Answer 1

BufferedImage img = .... public boolean isTransparent( int x, int y ) { int pixel = img.getRGB(x,y); if( (pixel>>24) == 0x00 ) { return true; } return false; } 

Of course, img must be in the correct TYPE_4BYTE_ABGR format or in some format that supports alpha channels, otherwise it will always be opaque (i.e. 0xff).

Answer 2

correct shift to get alpha value in int with →> due to sign bit.

Example: int alpha1 = (pixel1 and 0xff000000) →> 24;