This is almost certainly using some kind of image processing rather than just metadata. http://similar-images.googlelabs.com/images?q=apple&prev=%2Fimages%3Fq%

This is almost certainly using some kind of image processing rather than just metadata. http://similar-images.googlelabs.com/images?q=apple&prev=%2Fimages%3Fq%3Dapple&qtype=similar&tprev=%2Fimages%3Fq%3Dapple&tbnid=u18bgKxb_hjznM&prev=/imgres%3Fq%3Dapple%26qtype%3Dlanding%26tbnid%3Du18bgKxb_hjznM&tprev=/images%3Fq%3Dapple http://similar-images.googlelabs.com/images?q=apple&prev... http://similar-images.googlelabs.com/images?q=apple&prev=%2Fimages%3Fq%3Dapple&qtype=similar&tprev=%2Fimages%3Fq%3Dapple&tbnid=eWVIkcHybqyfqM&prev=/imgres%3Fq%3Dapple%26qtype%3Dlanding%26tbnid%3DeWVIkcHybqyfqM&tprev=/images%3Fq%3Dapple http://similar-images.googlelabs.com/images?q=apple&prev... http://similar-images.googlelabs.com/images?q=apple&prev=%2Fimages%3Fq%3Dapple%26qtype%3Dsimilar%26tbnid%3Du18bgKxb_hjznM&qtype=similar&tprev=%2Fimages%3Fq%3Dapple&tbnid=Y8f5vYEJ-Zjj6M&prev=/imgres%3Fq%3Dapple%26qtype%3Dlanding%26tbnid%3DY8f5vYEJ-Zjj6M&tprev=/images%3Fq%3Dapple http://similar-images.googlelabs.com/images?q=apple&prev...