I opted for the purchase of Denoise Projects Professional because it using mathematical algorithms offers the "normal" Hiss also the opportunity to de-noising by offsetting the image with dark and flat frames. This can be removed from the image not only the dark noise of the camera sensor, but also all kinds of dirt of the sensor to vignetting caused by the lens. However, for images that contain very little noise, I use Denoise Projects to reduce chromatic aberrations or compensate for the chrominance, if my picture a "color cast" has - in these cases, I use a completely empty preset, so really only these effects be applied to my photo. Especially for irreplaceable photos of family celebrations or other events where I had to make do with the necessity "available light", the editor has paid with Denoise Projects - many photos that I otherwise would show anyone I could save it.
