Java images collision

So, i'm trying to check collision between 2 images. The images have transparency, and the content may be as simple as a solid colores square, or as complex as a game character. Now, i need to find out wheter the image is colliding or not with other images. Per pixel collision is not a valid option, as image size can be really big, and that would be reeally unefficient, so whats my best option to detect if two images are overlapping (or simply colliding), without requiring a NASA computer? Thanks a lot guys!



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