I have been experimenting with the HTC One camera and tried the filters or effects you can switch on before you take a photo. Of course the editing options after you take a photo are numerous including removing people out of your photo who appeared .

Rather than describe each effect in detail just look at the same item with different effects applied. Some really interesting differences.

The above distorts the tea cake.

The above creates a darker edge. Ideal for focusing central subject.

The above is rather unusual.

The last one looks a bit creepy but all in all some amazing results.