Autodesk 62205-051408-9001 User Guide - Page 685

Correcting Color Imbalances ❚❘❘ To delete a color correction at the current frame: 1. Select a matte or the entire image from the Work On list (Master, Sel 1, Sel 2, or Sel 3). 2. Select the C button next to the Work On list. The color correction is cleared at the current frame and a keyframe is set. If you selected a matte (Sel 1, Sel 2, or Sel 3) from the Work On box, the matte is unaffected and its keyframes are not cleared. Correcting Color Imbalances During production, differences in lighting and equipment often create color imbalances in and between clips. When you work on these clips in the Color Warper, you should perform a basic color correction to color balance them. You can balance colors using the tools in the Basic controls. Perform your tasks in the following order: 1. Set black and white levels. 2. Remove unwanted color. Setting Black and White Levels When you balance the colors in a clip, you should always start with the darkest and lightest parts of the image. You may, for example, need to establish parameters for the black and white (luma) content to ensure that the intensity of the image is in accordance with established broadcast parameters. These parameters are known as black points and white points. You use the Black and White fields to establish black and white points. Black field-Modifies the luma in the image's shadows without affecting the chroma. White field-Modifies the luma in the image's highlights without affecting the chroma. To set black and white levels: 1. Sample the highlights in the image. To determine the white point, select a white that appears to be flat rather than reflective so that you obtain a more accurate reading. Do not use a highly reflective surface such as a window or metal surface, as they are often too bright. Enable the Plot color picker and then sample the whites in the result clip. In the Basic controls, a red plot line is displayed in the 2D luma histogram indicating the luma value of the sampled whites in the result clip. 2. While viewing the 2D luma histogram and the image, adjust the value of the White field to modify the luma value and set the white point- drag left to darken the highlights and right to lighten them. The Plot sample is updated as you drag the field. Hint: You can view both the 2D luma histogram and 2D vectorscope to determine what adjustments you need to make to the highlights. For example, if the white point is set to an acceptable level in the 2D luma histogram but the sampled chroma value shows an unwanted color cast in the 2D vectorscope, use the Highlights trackball to modify the chroma value in the highlights. See Removing Unwanted Color. 669