May 23

The PixelGrabber can be used to get a ColorModel instance that has a method to tell if alpha is supported. You just need to load a single pixel from the image to get the ColorModel.

PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
boolean hasAlpha = pg.getColorModel().hasAlpha();

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May 23

The BufferedImage’s ColorModel has a method that returns whether it supports alpha.

boolean hasAlpha = bufferedImage.getColorModel().hasAlpha();

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