Adobe 29180155 User Guide - Page 148

ADOBE PHOTOSHOP ELEMENTS 4.0 143 User Guide 6 In the image, click the highlight area that you identified. If you accidentally click the wrong highlight, click Reset and try again. The pixel values throughout the image are adjusted proportionately to the new highlight values. Any pixels lighter than the area you clicked become specular white. The Info palette shows the values both before and after the color adjustment. 7 Double-click the Set Black Point eyedropper tool in the Levels dialog box to open the Color Picker. Enter the values you want to assign to the darkest area in the image, and click OK. Follow these guidelines: • When you're printing on white paper, you can achieve a good shadow in an average-key image by using RGB values of 10, 10, 10. An approximate grayscale equivalent is a 96% dot. • You can approximate these same values quickly by entering 4 in the Brightness (B) text box under the HSB section of the Color Picker. • With a high-key image, you might want to set the shadow to a higher value to maintain detail in the highlights. Experiment with Brightness values between 4 and 20. 8 In the image, click the shadow area that you identified. 9 Click OK. See also "About Levels adjustments" on page 129 "To create adjustment layers" on page 96 Understanding color About color The human eye perceives color in terms of three characteristics-hue, saturation, and brightness (HSB), whereas computer monitors display colors by generating varying amounts of red, green, and blue (RGB) light. In Photoshop Elements, you use the HSB and RGB color models to select and manipulate color. The color wheel can help you understand the relationships among colors. HSB model Based on the human perception of color, the HSB model describes three fundamental characteristics of color: Hue The color reflected from or transmitted through an object. It is measured as a location on the standard color wheel, expressed as a degree between 0 and 360. In common use, hue is identified by the name of the color such as red, orange, or green. Saturation The strength or purity of the color. Saturation, which is sometimes called chroma, represents the amount of gray in proportion to the hue, measured as a percentage from 0 (gray) to 100 (fully saturated). On the standard color wheel, saturation increases from the center to the edge. Brightness The relative lightness or darkness of the color, usually measured as a percentage from 0 (black) to 100 (white). Although you can use the HSB model in Photoshop Elements to define a color in the Color Picker dialog box, you cannot use the HSB mode to create and edit images.