User Guide

Chapter 5: Painting And Image Editing
Grayscale ramp The grayscale ramp shows the lightness scale, either 0-255 (dark to
light) or 0-100 percent (light to dark). Click the ramp to reverse the
scale and the curve.
Input and Output Type brightness values in the Input and Output boxes. Or, drag the
pointer (circled) to specify brightness values.
Icon Click this icon and drag a point on the curve to reshape the curve. Click
the curve to add up to 19 control points. Drag points off the curve to
delete them.
To draw a disconnected segment, click this icon and drag in the graph.
Pencil With the pencil selected, click to smooth the curve.
To adjust brightness curves:
1. Select one paint object to adjust. The paint object can be in edit mode. You can select an
area in the image. If you don’t make a selection, the entire image is affected.
2. Choose Image | Adjust | Curves.
To redraw the curve completely, or to create sharp changes in brightness for a tonal
range, click the pencil and draw a new curve or segment.
3. In the Channel pop-up menu, select the composite channel or an individual channel to
adjust. To adjust multiple channels, select the channels in the Channels palette first.
4. To change the shape of the existing curve, make sure the curve button at the bottom-left is
selected.
Click points that you want to keep the same.
Drag points on the curve that you want to change. Or, enter values in the Input and
Output boxes. For example, to keep midtones the same, click the center of the curve, then
drag other areas of the curve. To adjust midtones without affecting highlights and
shadows, click the quarter and three-quarter points of the curve, and drag the middle.
5. If you draw disjointed segments with the pencil, you can click Smooth to create one
continuous curve.
6. Click OK to apply the current settings to the image.
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