Adobe 13101332 User Guide - Page 262

Adobe Photoshop Help Using Help | Contents | Index Painting Back 262 Specifying a color using the color field and color slider With the HSB, RGB, and Lab color modes, you can use the color field and the color slider in the Color Picker dialog box to select a color. The color slider displays the range of color levels available for the selected color component (for example, R, G, or B). The color field displays the range for the remaining two components-one on the horizontal axis, one on the vertical. For example, if the current color is black and you click the red component (R) using the RGB color model, the color slider displays the range of color for red (0 is at the bottom of the slider and 255 is at the top). The color field displays the values for blue along its horizontal axis, for green along its vertical axis. To specify a color using the color field and color slider: 1 Click a component next to the HSB, RGB, or Lab values. 2 Select a color: • Drag the white triangles along the slider. • Click inside the color slider. • Click inside the color field. When you click in the color field, a circular marker indicates the color's position in the field. As you adjust the color using the color field and color slider, the numerical values change to reflect the new color.The color rectangle to the right of the color slider displays the new color in the top section of the rectangle. The original color appears at the bottom of the rectangle. Specifying a color using numeric values In the Adobe Color Picker, you can select a color in any of the four color models by specifying numeric values for each color component. To specify a color using numeric values: Do one of the following: • (Photoshop) In CMYK color mode (the mode PostScript printers use), specify each component value as a percentage of cyan, magenta, yellow, and black. • In RGB color mode (the mode your monitor uses), specify component values from 0 to 255 (0 is black, and 255 is the pure color). • In HSB color mode, specify saturation and brightness as percentages; specify hue as an angle from 0° to 360° that corresponds to a location on the color wheel. For more information on the color wheel, see "About color modes and models (Photoshop)" on page 86. • (Photoshop) In Lab mode, enter a lightness value (L) from 0 to 100 and a axis (green to magenta) and b axis (blue to yellow) values from -120 to +120. Using Web-safe colors The Web-safe colors are the 216 colors used by browsers regardless of the platform. The browser will change all colors in the image to these colors when displaying the color on an 8-bit screen.The 216 colors are a subset of the Mac OS 8-bit color palettes. By working only with these colors, you can be sure that art you prepare for the Web will not dither on a system set to display in 256 colors. Using Help | Contents | Index Back 262