This tool consists of an array of plugins you can use from Adobe Photoshop’s filters tab. Nik Collection has eight independent modes among which you can find many different effects.
The first block, Analog Efex Pro, comes with nine filters to give your pictures the look and feel of a classic camera. All you have to do is click on them and they'll be applied to your image, although you can also add 'scratches and dirt', cartoon, and movie filters to make your pictures look properly old school.
Color Efex Pro is the second tool in this pack, offering up to 55 different effects to set control points and highlight the different elements that compose the photo. Dfine lets you adjust the contrast and reduce color noise separately, thus improving the photo quality so you don’t notice the grain.
HDR Efex Pro lets you create HDR photos combining the different features of this effect and modifying the tone, tone compression, and color. This option recovers any lost highlights, reduces shadows, and adjusts tonality to achieve the perfect level of naturalness and balance. With Sharpener Pro you can selectively improve your image's sharpness by applying control points to focus on.
Silver Efex Pro contains a total of 38 black and white or sepia effects that help you achieve a modern or classic look, depending on your needs. Finally, the last option in Nik Collection is Viveza, a feature to adjust brightness, contrast, saturation, shadows, and RGB hues to control the picture’s warmth and get a more intense look.