Adobe Photoshop CS4 Manual de usuario descargar pdf (Pagina 129)

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USING PHOTOSHOP CS4

Color fundamentals

Last updated 1/10/2010

Choose a color using the Lab model

When choosing a color based on the Lab color model, the L value specifies the luminance of a color. The A value

specifies how red or green a color is. The B value specifies how blue or yellow a color is.

1 In the Adobe Color Picker, enter values for L (from 0 to 100), and for A and B (from -128 to +127).

2 (Optional) Use the color slider or color field to adjust the color.

Choose a color using the CMYK model

You can choose a color by specifying each component value as a percentage of cyan, magenta, yellow, and black.

❖ In the Adobe Color Picker, enter percentage values for C, M, Y, and K, or use the color slider and color field to

choose a color.

Choose a color by specifying a hexadecimal value

You can choose a color by specifying a hexadecimal value that defines the R, G, and B components in a color. The three

pairs of numbers are expressed in values from 00 (minimum luminance) to ff (maximum luminance). For example,

000000 is black, ffffff is white, and ff0000 is red.

❖ In the Adobe Color Picker, enter a hexadecimal value in the # text box.

Choose web-safe colors

The web-safe colors are the 216 colors used by browsers regardless of the platform. The browser changes all colors in

the image to these colors when displaying the image 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 256 colors.

Select web-safe colors in the Adobe Color Picker

❖ Select the Only Web Colors option in the lower left corner of the Color Picker. Any color you pick with this option

selected is web-safe.

Change a non-web color to a web-safe color

If you select a non-web color, an alert cube appears next to the color rectangle in the Adobe Color Picker.

❖ Click the alert cube to select the closest web color. (If no alert cube appears, the color you chose is web-safe.)

Select a web-safe color using the Color panel

1 Click the Color panel tab, or choose Window > Color to view the Color panel.

2 Choose an option for selecting a web-safe color:

• Choose Make Ramp Web Safe from the Color panel menu. Any color you pick with this option selected is web-safe.

• Choose Web Color Sliders from the Color panel menu. By default, web color sliders snap to web-safe colors

(indicated by tick marks) when you drag them. To override web-safe color selection, Alt-drag (Windows) or

Option-drag (Mac

OS) the sliders.

If you choose a non-web color, an alert cube appears above the color ramp on the left side of the Color panel. Click

the alert cube to select the closest web color.

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