Effects Dust, Scraches and Reduce Noise

Photoshop has over 100 Filters devided in 14 categories.
The filters can do important work.Here i will show you all standart filters and i will explain important things about them.
The filters are lockated in the Filter menu.
Lets start with the filters Noise submenu:

Picture before filters:

Dust & Scraches
Blurs the image with dust and scraches:
Picture after filter Dust & Scraches:

Reduce Noise
Sharpens the colors of the image.
Picture after filter Reduce Noise: