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Chapter 6. Understanding Curves > Input and Output Numbers

Input and Output Numbers

The Input and Output numbers at the bottom of the Curves dialog box allow you to be very precise when adjusting an image. Input is the shade of gray being changed; Output is what it will become. When the points on the curve appear as hollow squares, the Input and Output numbers relate to your pointer. The Input number tells you which shade of gray is directly below your pointer. The Output number tells you what the shade of gray (height of the bar chart) would be if you moved the curve to the height of your pointer.

Try it. First, click the curve icon (not the pencil), and then make sure that none of the points on the curve are solid. Do this by moving your pointer around until it looks like a white arrow, and then click the mouse. Now move your pointer around the grid area. You'll notice the Input and Output numbers changing. All they're doing is telling you which shades of gray are directly below and to the left of your pointer (Figure 6.57). If you trace over the shape of a curve, the Input and Output numbers will show you exactly what the curve is doing to all the shades of gray in your image.


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