Secondary Colour Grading > Creating a Secondary by Keying a Range of Colours > 
Using the Hue, Luminance, and Saturation (HLS) Keyer to Extract a Key
 
 
 

With the HLS Keyer, you can extract a key based on hue, luminance, and saturation channels. You can use one or more of these channels to create a key.

You can also use previously saved keyer presets. See Saving and Loading Presets Using the Presets Lists.

Once you have extracted a key, you can modify a key by adjusting the Master Tolerance and Master Softness sliders or by using the Add/Remove Softness and Tolerance buttons. You can further modify a key using the Cleanup, Shrink, and Blur parameters.

Before extracting a key, you can modify the source image by using the Input Transform Log to Lin and Soften options. See Tools Settings.

NoteTo disable the HLS Keyer at any time, right-click on the Keyer option box.

Use the following workflow to extract a key for colour isolation.

Step: Refer to:
1. Determine which channels you want to use in a key. See Setting Keying Parameters in the HLS Keyer.
2. Select the colour that you want to key. See Sampling a Colour in the HLS Keyer.
3. View your secondary to determine the range of colour you have keyed. See Viewing Secondaries in the HLS Keyer.
4. Set the tolerance to widen or narrow the range of luminance and chrominance values to extract in a key. See Setting the Tolerance Range in the HLS Keyer.
5. Set the softness to widen or narrow the range of luminance and chrominance values to extract at the edge of a key. See Setting the Softness Range in the HLS Keyer.
6. Blend the light and dark edges of a key by shrinking, eroding, or blurring the edges of a key. See Modifying the Edges of the Key.
7. Clean up a key for colour grading. See Removing Stray Pixels from a Key.
8. Increase or decrease the softness of pixels that are in the tolerance range. See Sharpening a Key Source Image.

The following procedures are not essential for extracting a key. You can perform these procedures at any time after extracting a key.

Step: Refer to:
1. Remove colours that you do not want to include in a key. See Inverting Keys.
2. Exclude a key that you do not want to appear in a secondary. See Excluding Keys from Secondaries.

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