5 things that I did not know about Photoshop

1. After saving a document the history palette clears all the contents.

2. Layer Masks allows you to hide certain parts of the layer that can be revealed by using the paintbrush and the white paint color to expose portions of the layer. 

3. Art History Brush paints over an image using the source data from a specified history state or snapshot.

4. How to enlarge an image properly by using percent enlargement.

5. The photoshop divides images up into tiled sections, so that it only has to memorize small changes to the image.