Entering Numbers

After you've created a point, it will appear as a solid square. This represents the point that's currently being edited. The Input and Output numbers at the bottom of the dialog box indicate the change this point will make to an image. The Input number represents the shade of gray that's being changed. The Output number indicates what's happening to the shade of gray—the value that you're changing it to. As long as the point appears as a solid square, you can type numbers into the Input and Output fields to change the location of the point (Figure 6.59).

Figure 6.59. To alter the position of a point on the curve, just change one of the numbers.

Those numbers can be very useful. We'll end up depending on them once we get into ...

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