Rotten apple - examples 1
JPEG - original photo & rotated copy
Rotten apple - examples 2
PNG - original photo & rotated copy
Rotten apple - examples 3
Canvas - original position & three rotated positions
Rotating methods. There are two methods to rotate digital pictures. You can rotate a JPEG in a program like Picasa or Paint. Then the results of rotating can be exported to a new file. The second method is rotating the JPEG (or PNG) in HTML Canvas.
The advantages of HTML Canvas. Rotating an image in Canvas can be done with a single source photo (in JPEG and PNG). Canvas nr. 1 represents the original position. Numbers 2-4 are rotated versions. But nr. 1-4 are produced by one JPEG source file.
Conclusion. Using Canvas on a website is a very good choice. You avoid placing multiple images on the server, including the original photo and the rotated versions of it. And secondly, you can easily adjust the values of the rotation without compromising the quality of the original JPEG.