I have found this tool that optimizes images for the web. What is surprising for me (of course, there will be other tools like this :)) is that it only optimizes the uploaded image if it is possible, ...
In Photoshop, you can easily divide the image into zones using point and click and it automatically generates the corresponding HTML with image slices addressed in tables. Gimp also has a Slice ...
I have the image in the URL (my server): http://www.example.com/example.jpg If my user put this image URL on his site: return the image (normal). If my user put this image URL on his browser: return ...