When adding a new image first of all you can modify the brightness and constrast of the selected file. 

From here you will be able to rotate the image with +- 90 degrees, 180 degrees and even rotate it arbitrary. 

Here you may easily choose from the large variety of effects. Just select the one you like most. 

Here you may easily choose from the large variety of effects. Just select the one you like most. 

In this submenu you can access the following features: effects, image quality and image properties.