لطفا منتظر باشید ...
Examining the Gray Balance Tools
The Gray Balance tools are your main weapons against white balance problems. When you're making adjustments, it's probably best to start with the 1-Point Gray Balance tool and progress to the 2-Point and then the 3-Point tools if you aren't getting the results you're looking for. Remember to return the clip to its original state before you move from tool to tool by clicking the Restore to Default button
; otherwise you'll make alterations on top of alterations.The 1-Point Gray Balance tool
Using this tool is the simplest and quickest way to alter a clip, but the results may not always be perfect on the first click. You should try clicking several times before you give up and move on to the next tool.
To use the 1-Point Gray Balance tool
| 1. | With the ColorCorrection Editor open and your target clip in the right window, click once on the 1-Point Gray Balance tool  which is located on the far right of the ColorCorrection interface in the one-click tools. | |
| 2. | Move the cursor over to the target area.A crosshair with a sun and a grayscale under it appears. | |
| 3. | Find an area that's as near to gray as you can and click it (Figure 11.25 ).Figure 11.25. Using the 1-Point Gray Balance tool. (See color insert.)
|
Tip- This method is quick and dirty. If you don't like the results, click somewhere else.
The 2-Point Gray Balance tool
Using this tool is a slightly more complex process than using the 1-Point Gray Balance tool. It gives you two points with which to correct the target. For it to work correctly, you need a target clip that has both an area of light gray and an area of dark gray.
To use the 2-Point Gray Balance tool
| 1. | With the ColorCorrection Editor open and your target clip in the right window, click once on the 2-Point Gray Balance tool . |
| 2. | Move the cursor over to the target area.A "2pt" appears under the crosshair where the sun was in the 1-Point tool. |
| 3. | Find an area that's as near to light gray as you can, then click and drag the mouse to an area of dark gray (Figure 11.26 ).Figure 11.26. Using the 2-Point Gray Balance tool. (See color insert.)[View full size image]  |
| 4. | Release the mouse and the color balance is applied using information it finds under both cursor positions. |
Tip- This method is a little more refined, but you may still need to select some more sample areas before the clip looks right.
The 3-Point Gray Balance tool
The 3-Point Gray Balance tool requires the same reference points that the 3-Point Color Balance tool required, but it doesn't need a reference clip. Instead it uses the target clip as its own reference in an attempt to adjust the levels of white, gray, and black.
To use the 3-Point Gray Balance tool
| 1. | With the target clip in the right window, click the 3-Point Gray Balance button.Three points linked by two lines appear on both screens. These are colored white, gray, and black. |
| 2. | Adjust the squares in the reference clip so that the black one is in the darkest area of the screen, the white one is in the lightest area, and the gray one is somewhere in between. |
| 3. | Once you're happy, right-click the mouse inside the right window to apply the effect.If you forget to do this, the effect isn't applied. |
![[View full size image]](/image/library/english/13865_11fig26_alt.jpg;380138){kind=link}