You have seen so many images on the Internet. However, how can you know that the image you seen is being edited by Photoshop or being changed by anyone else before.
Now, you can check it using image error level analyser. By submit an image URL for error level analysis, you can check if an image has been digitally transformed and manipulated. If no alterations in the image, all sections of the photo will be at the same quality.
In fact, a jpeg format photo will lose quality each time it is being resaved, so we can take this advantage to Using this analyzer, you will be able to see the difference in quality level which is represented by the brightness of colors to check whether an image is modified or original.