Placing Anchor Points without Modifying the Curve

When you add anchor points to a curve, it's very easy to disturb it and thereby change the input and output values. To get around this obstacle, move the mouse pointer outside the dialog box, hold down Ctrl (Windows), § (Mac OS), and then click the point in the image that you would like to adjust. Photoshop will place a corresponding anchor point on the composite curve based on the sample point (Figure 3-12).

wOTEl If the image is in CMYK mode, this method of placing anchor points has no effect on the composite curve, though you can place them on the curves for the individual channels. If the image is in Lab mode, the anchor point is placed on the Lightness channel.

To place corresponding anchor points on the curves for the individual channels, press Ctrl+Shift (Windows), §6 + Shift (Mac OS) as you click in the image. This keyboard shortcut places anchor points only on the individual channel curves and not the composite channel.

Figure 3-12: You can place an anchor point on the curve by Ctrl-clicking (Windows), ^-clicking (Mac OS) in the image.

0 0

Post a comment