Making Corrections Using the Hue Offsets Tab
To make a correction using the Hue Offsets tab:
1.  If you have not already done so:
a.  Move the position indicator to the segment you want to correct.
b.  Click the HSL tab.
c.  Click the Hue Offsets subdividing tab.
2.  Make your adjustments by doing one or more of the following:
  Click one or more of the automatic color correction buttons. For more information, see Adjusting Contrast and Balance Automatically.
  Use one or more of Remove Color Cast buttons below the ChromaWheels. For more information, see Using the Remove Color Cast Buttons.
  Use the Color Match control to calculate an offset automatically, based on input and output colors. For more information, see Using the Color Match Control.
  Move the crosshair pointer on the appropriate ChromaWheel control. For more information, see Using the ChromaWheel Crosshair Pointers.
As you move the pointer in the wheel, the Hue and Amount text boxes update to display numerical values for the adjustment.
  Type values in the Hue and Amount text boxes for the appropriate ChromaWheel control to set the offset you want. You must press Enter (Windows) or Return (Macintosh) after typing a value for it to take effect.
Hue values range from –180░ to 180░ where 0░ is the position of red on the wheel. Amount values range from 0 to 100. When you change the Hue and Amount values, the pointer on the ChromaWheel control updates to represent the adjustment.
  You can "nudge" the numerical value of a control up or down by small increments. To do this, click in the text box, and then press the Up Arrow key to increase the value or the Down Arrow key to decrease the value.
  Adjust one or more of the Gain, Gamma, and Setup controls. For more information, see Using the HSL Sliders and the following table.
3.  Fine-tune your adjustments until you are satisfied with the result.
Remember that you can make adjustments on more than one ChromaWheel control and turn them on and off individually to assess their effect on the image.
Hue Offsets Tab Controlsá
Control
Description
Gain
Adjusts the gain or white point for the image. Values range from 0 to 200, where 100 represents the unchanged image.
The main difference between Brightness (on the Controls tab) and Gain is that Brightness adjusts by adding to the 8-bit luminance value of every pixel, while Gain makes an adjustment based on a percentage of the original luminance.
Gamma
Adjusts the midpoint of the luminance range. Values range from 0.1 to 10, where 1 represents the unchanged image. Lowering the value darkens the midtones and brings the image closer to black. Raising the value lightens the midtones and brings the image closer to white.
Setup
Adjusts the setup or black point for the image. Values range from –255 to 255, where 0 represents the unchanged image (no offset).
The effect of the Setup control is very similar to that of the Brightness control (on the Controls tab). One important difference, however, is that the Setup control interacts with the Gain and Gamma controls, while the Brightness control interacts with the Contrast control. If you have made an adjustment using the Gain or Gamma controls, it is better to adjust luminance further using the Setup control. If you have made a Contrast adjustment, it is better to adjust luminance further using the Brightness slider.
See Also
Understanding the ChromaWheel Controls
Using the ChromaWheel Crosshair Pointers

Some features described in Help are available only in Avid Xpress Pro or Avid Xpress DV. For more information about Avid Free DV go to
www.avid.com.