Nik Collection is a set of plug-ins for editing images. It can be installed in popular image editing applications like Photoshop. The software includes tools such as "Dfine" for noise reduction in images and "Color Efex Pro" for color correction, retouching, etc. "Viveza" tool is also for color correction. "Sharpener Pro" lets you sharpen the images. "Silver Efex Pro" if for black and white image adjustments.