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RGB LUT Fields
The LUT fields adjust the various aspects of the basic LUT. Each parameter has red, green, and blue fields, plus a lock button that keeps the three RGB fields locked together while you adjust one.
Reference White
Sets the clipping value for white. Color values above this value are set to white.
Reference Black
Sets the clipping value for black. Color values below this point are set to black.
Highlight
Sets the highest color value to be used for the output.
Shadow
Sets the lowest color value to be used for the output.
Film Gamma
Sets the gamma. A Gamma value of 1 creates a flat curve. Increase Gamma to brighten the mid-tones, reduce gamma to darken mid-tones.
Note: Use Gamma Correction to compensate for the monitor. Film gamma comes from the scanner itself; you rarely change film gamma.
Gamma Correction
Sets the gamma correction. Use the menu next to the parameter to choose from several common gamma values.
Soft Clip
Smooths the shoulder area of the conversion curve. Reduce the soft clip point to restore details in highlights.
To set the LUT fields:
- Before you adjust LUT fields, you should make sure the monitor is properly calibrated.
- Modify the Reference White and Reference Black values, if necessary.
- If the type of conversion is Log to Linear or Linear to Log, adjust the Film Gamma, if necessary.
- If the type of conversion is Log to Linear or Linear to Log, adjust the RGB SoftClip values, if necessary.
- Adjust the Highlight, Gamma Correction (midtones), and Shadow areas, if necessary.
More details are in the following sections. For example, see Using the Histogram and RGB Curves.
When you adjust LUT settings, you should use an image that is representative of the scene. If possible, try to use a reference image that contains the brightest and darkest values in the shot.
When you promote the bit depth of an image and then later demote the bit depth, the LUT used for demoting should be the inverse of the one used for promoting. This means the settings need to be inverted, not just the bit depth (such as "8 to 10" and then "10 to 8").
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