Smooth out chroma and luminance noise while preserving important detail
Last issue we demonstrated how the Detail panel can enable you to sharpen a photo while keeping noise at bay. Noise is added to a photo when using a high ISO sensitivity setting on your camera, or when shooting at night with a slow shutter speed. There are two types of noise – luminance (greyscale) and chroma (colour). Luminance noise appears throughout the image’s tonal range as tiny dots. Chroma noise manifests itself as tiny patches of distracting rainbow colours, which are especially noticeable in detail-free sections of a JPEG image, such as a sky.
Luminance noise can be compared to character-adding film grain, so it’s less distracting or undesirable than chroma noise. Here we’ll show you how you can use the Detail panel’s Noise Reduction tools to smooth out luminance noise while preserving important image detail.
It’s much easier to remove chroma noise without losing detail, as you will see in the following walkthrough.