The graphics object bar (Figure 31-1) is only available when you select a raster object. It allows you to change color saturation, etc. If it isn't displayed, choose View > Toolbars > Object Bar. Figure 31-1. Graphics object bar available when raster object is selected
Note The gamma value is a measurement unit used for contrasting gray tones. Editing RGB Color ValuesYou can increase or decrease the red, green, or blue in an image just by entering different numbers or clicking the arrows, in the image-editing toolbar.
To make the toolbar appear, click on the image. Make the adjustments you want by entering a number or clicking the up and down arrows. Changing Color ResolutionYou can reduce the number of colors in a bitmap to optimize it for Web use, for instance. Examples are shown in Figure 31-2. Figure 31-2. Examples of different color resolutions
To change the resolution, right-click the object and select the appropriate color resolution, as shown in Figure 31-3. You can change the resolution of only one object at a time; if you select two or more objects, the Color Resolution item won't appear. Figure 31-3. Changing color resolution
Changing Selected Colors in Images Using the EyedropperOne of the most powerful features of Image is the eyedropper. You can use the eyedropper tool to sample change a color to a different color everywhere it appears in your image. You may get unexpected results; one of the colors you select to be changed might show up in your graphic where you don't expect it. Carefully check the results you get, and be prepared to use the Undo feature.
Editing Contrast and TransparencyThe image editing toolbar also lets you change the following values:
To make the toolbar appear, click on the image. Make the adjustments you want by entering a number or clicking the up and down arrows. |