Autodesk 62205-051408-9001 User Guide - Page 733

Matching Grain ❚❘❘ 4. Draw a selection box on one of the major colors in the source image. Be careful to select areas of uniform color with no image detail. Note: You should not sample from the target image you are working on. Control points appear in the appropriate channels of the curve editor; the points reflect the extracted intensity for the average luma of the selected grain field. Curve checkboxes for each curve Curves with control points 5. Draw a selection box in the source image. Control points are added to the curve for the three colors at the same time. Note: Repeat these steps as necessary and try to sample areas of the image of all intensities (shadows, midtones, and highlights). In most cases, these are the only steps you need to do to get a perfect match. 6. You can continue the process by comparing the grain. Compare the Grain There are several ways to set up the viewports or images to compare the grain of two images: • Use the Compare tool to compare your re-grained clip with one of five stored settings or an operator. You can also compare different grain settings on the same image to see which you prefer. Note: For information on the Compare tool, see Using the Compare Tool. • Show the composite. If the two images are both in the composite, you can compare the grain if, for example, there is a matte on the front image or layers are arranged a certain way. • Use multiple viewports. You can show the images in separate viewports, but make sure that the zoom for both is the same. Once you can see both images (or clips), you can compare the grain, and decide on the size or color adjustments to apply. While comparing the re-grained image to another operator using the Compare tool, you can use the Match Grain picker on the compare region. (You should not do this if you are comparing it to stored settings for the same image.) Note: Grain is applied to the entire image (that is, the image that is visible with respect to the alpha channel) even when you are using the Compare tool. In other words, processing takes the same amount of time regardless of how much of the target image you are viewing. Sometimes, you may need to reapply the original grain to a de-grained clip (for example, if you degrained it get a better key). You can do this by comparing and matching the original clip to the degrained clip across every necessary area of the image. Note: You can also use this method to build a very accurate Add Grain setup from a grainy clip: de-grain it, match the grain, and save the setup to be used on other clips. 717