Well let's just come to a conclusion that those type of images are bigger scaled images and the Google search engine actually scales them and saves them into image caches. Infinityx probably means that the image is reaching the maximum allowed width that has been set by the
Google image service, so that's why "Infinity
x" is displayed on images like that, I think there can occur some "Infinity
y" aswell, it's a image size thing (
y = height) and (
x = width) to be simple and pedagogical. I also found the
Images Java API. That's all I can tell.