TinEye is a powerful image search and recognition engine that can help to find where an image came from and how it's being used. It uses a reverse image search where unique digital signatures are created for each submitted image and then compared to other indexed images to find matches. Tineye finds exact matches, including images that have been altered (cropped, resized, etc). It typically doesn't find similar images but can find images with parts copied from other images.
- Google-image is looking for similar pictures, and searches by text. TinEye just write a message about a unique image.