Chroma Keying and Working with Green Screens > Refining Your Key >

# Adjusting the Luminance of the Key

After creating a key, you can adjust luminance values to fine-tune the result. The 2D Histogram node in the schematic displays the distribution of luminance values within the matte. The horizontal axis of the histogram represents the range of luminance values in the matte and spans from 0 (black) to 255 (white). The vertical axis shows the number of pixels at each luminance value.

#### Topics in this section

- Setting the Range of the Luminance Values
- Remapping Black and White
- Boosting the Luminance of the Key Using Gain and Lift
- Using the Luminance Curves