Autodesk 62205-051408-9001 User Guide - Page 686

25 Color Warper 3. Enable Plot and sample the shadows in the result clip to determine the black level. Sample the darkest part of the image to determine the black point. A red plot line is displayed in the 2D luma histogram indicating the luma value of the sampled blacks in the result clip. 4. While viewing the 2D luma histogram and the image, adjust the value of the Black field to modify the luma value-drag left to darken the shadows and right to lighten them. The Plot sample is updated as you drag the field. Hint: Once the black level is set, you can use the Shadows trackball to adjust the chroma values in the highlights while viewing the plot sample in the 2D vectorscope. See Removing Unwanted Color. Removing Unwanted Color Unwanted color can be caused by factors such as inconsistent lighting conditions during a shoot or incongruities between the white levels set on a video camera and the given lighting conditions. Factors such as these can result in clips or images that contain unnatural-looking colors or one predominant color, which gives the image an unwanted color cast. After setting black and white points, you can remove the unwanted color without affecting the black and white levels. You can: • Use the Shadows, Midtones, and Highlights trackballs to remove color from the shadow, midtone, and highlight ranges. • Use the Suppress trackball to remove a range of color, such as a color cast that pervades the entire image. Not all color casts detract from the natural appearance of the image. Before you remove a color cast, it is best to analyze the image or clip, both in relation to other clips in the project and with an eye to maintaining the atmosphere or mood inherent to the clip. For example, images of sunny summer days should have a reddish cast to convey an atmosphere of warmth. Completely removing the reddish cast may result in a colder feel than you want. In cases where the cast is a complementary one, you may want to refine it to improve the overall effect. See Creating Color Casts. The Shadows, Midtones, and Highlights trackballs in the Basic controls are described as follows. Shadows trackball-Modifies the chroma in the darkest areas of the image without affecting the luma. Midtones trackball-Modifies horizontal RGB curves in the 2D luma histogram. These curves represent the amount of chroma tint you apply to the image. For example, if the red and green curves are above the middle line while the blue curve is below the middle line, you are adding a yellow tint to the midtone components of your image. By default, the Midtones trackball affects all ranges except white and black, as shown by the histogram's RGB curves. To set the luma range affected by the Midtones trackball, use the two midtones triangles below the 2D luma histogram. Drag the triangles closer together to decrease the range and further apart to increase it. You can modify the range as many times as you like. 670