Photoshop cs5 by steve Johnson part 30 pps

The Duotone Color mode converts a grayscale image into a monotone 1-color, duotone 2-color, tritone 3-color, or quadtone 4-color image using 1 to 4 custom inks.. Photoshop's Replace Colo

The Duotone Color mode converts a grayscale image into a monotone (1-color), duotone (2-color), tritone (3-color), or quadtone (4-color) image using 1 to 4 custom inks Duotones are frequently used to increase the tonal depth of a grayscale image For example, most print-ing presses produce 50 levels of gray per color By convertprint-ing an image into a duotone, and using black and a mid-gray value, the press can produce a grayscale image with more dynamic range A more common method for employing the Duotone color mode is to create an image with an overall color cast, for example, by converting the grays in the image to a sepia tone If you're uncertain how to create the proper color mix for a duotone image, Photoshop comes equipped with dozens

of sample duotone, tritone, and quadtone color presets

Understanding the

Duotone Color Mode

Convert an Image to Duotone

Open an image Click the Image

menu, point to Mode, and then

click Duotone.

IMPORTANT Before converting

an image into a duotone, it must

first be in the Grayscale color

mode

Choose from duotone presets

available in the Preset drop-down

menu Choose to save or load a

preset by clicking on the menu

options triangle to the right of the

preset menu

Click the Type list arrow, and then

select from the following options:

◆ Monotone Uses one color to

generate image tone (limited

dynamic range)

◆ Duotone Uses two colors to

generate image tone (better

dynamic range for B&W

images)

◆ Tritone Uses three colors to

generate image tone

◆ Quadtone Uses four colors to

generate image tone

Click the Overprint Colors button to

adjust how the colors will display

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Duotone color mode

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The Multichannel color mode is a specialized mode that converts the original color channels into shades of gray, with the grays based on the luminosity values of the original image The original channels are con-verted into spot colors Since Multichannel mode is used almost exclu-sively by the printing industry, converting a CMYK image into

Multichannel color mode produces Cyan, Magenta, Yellow, and Black spot channels, and converting an RGB image into Multichannel mode produces Cyan, Magenta, and Yellow spot channels, minus the Black channel In both instances, converting to Multichannel Color mode causes the loss of the Composite channel

Using Multichannel

Color Mode

Use the Multichannel

Color Mode

Open an image

Click the Image menu, point to

Mode, and then click

Multichannel.

Photoshop converts the image

into the Multichannel mode

IMPORTANT Images

converted to the Multichannel

mode must be saved in the DCS 2.0

format (Desktop Color

Separations) The DCS 2.0 format

generates a separate file for each

of the image’s spot colors

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The Multichannel panel minus the Composite channel

See Also

See “Preparing an Image for the

Press” on page 402 for more

informa-tion on saving an image in the DCS 2.0

format

Photoshop's Replace Color command lets you create a selection based

on image color, and replace that color selection with any other color

The Replace Color adjustment accomplishes this by giving you access

to the three components of color: Hue, Saturation, and Brightness Hue gives you the ability to change the image's actual color, Saturation con-trols the amount of color, and Brightness determines how bright the color is based on its Hue and Saturation

Using the Replace

Color Adjustment

Use the Replace Color

Adjustment

Open a color document

Click the Image menu, point to

Adjustments, and then click

Replace Color.

Select the Localized Color

Clusters check box if you want to

limit your color selection to a

specific area on the active

document, using the Selection

eyedroppers to select, add, or

subtract colors

Click the Color box to select a

specific color for the selection

Drag the Fuzziness slider to

increase or decrease the

sensitivity of the eyedropper tools

Click the Selection or Image

option to toggle between a view of

the selection mask and the active

image (white areas of the mask

represent selected areas)

Drag the Hue, Saturation, and

Lightness sliders to change the

selected areas

Select the Preview check box to

view the changes in the active

document

Click OK.

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Photoshop not only lets you select virtually any colors you desire, it also lets you store those colors for future use For example, you create

a color scheme for a recurring brochure and you want a way to save those colors, or you're working on an Internet graphic and you need a web-safe color panel Whatever your color needs, Photoshop stands ready to meet them The Color panel gives you access to Photoshop's color-generation tools This single panel lets you create colors using 6 different sliders, 2 spectrum color selectors, a grayscale ramp, and an option that lets you create a color ramp for the current foreground and background colors

Working with the

Color Panel

Work with the Color Panel

Select the Color panel.

Click the Color Options button.

Select from the following Color

Sliders:

◆ Grayscale Creates a single

slider going from white (0) to

black (100)

◆ RGB Creates three sliders (red,

green, and blue) Each slider

has a possible value from 0 to

255

◆ HSB Creates three additive

sliders (hue, saturation, and

brightness) Each slider has a

possible value from 0 to 255

◆ CMYK Creates four subtractive

sliders (cyan, magenta, yellow,

and black) Each slider has a

possible value from 0 to 100

◆ Lab Creates three sliders

(L, a, and b) The L slider has a

possible value from 0 to 120,

and the a, b sliders have a

possible value from -120 to 100

◆ Web Color Creates three

sliders (red, green, and blue)

Each slider has a possible

hexadecimal value from 00

to FF

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Click the Color Options button, and

then select from the following

Spectrums or Ramps:

◆ RGB Converts the lower

portion of the Color panel to the

RGB spectrum Clicking

anywhere in the spectrum

changes the active color.

◆ CMYK Converts the lower

portion of the Color panel to the

CMYK spectrum Clicking

anywhere in the spectrum

changes the active color.

◆ Grayscale Converts the lower

portion of the Color panel to a

grayscale ramp Clicking

anywhere in the ramp changes

the active color

◆ Current Colors Converts the

lower portion of the Color panel

to a color ramp, using the

current foreground and

background colors Clicking

anywhere in the ramp changes

the active color.

To restrict the color ramp to

only web-safe colors, click the

Color Options button, and then

click Make Ramp Web Safe.

To change a color using the Adobe

Color Picker, double-click a color

box, select a color using the color

range or color mode options, and

then click OK.

You can choose colors using four

color models: HSB, RGB, Lab, and

CMYK

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Select options or click the color range to select a color.

Cube indicates the color is not web-safe; click to select the closest web color

An alert triangle indicates the color is out of gamut (non-printable).

Understanding Spectrums and Ramps

Spectrums and Ramps are located at the bottom of the Color panel, and represent the entire spectrum for the chosen color space For example, the CMYK spectrum displays a rainbow of colors in the CMYK color gamut Moving the eyedropper into the spectrum box

For Your Information

Photoshop not only lets you select virtually any colors you desire, it also lets you store those colors for future use in a library of color swatches, the Swatches Panel Where the Color panel lets you select virtually any color you need, the Swatches panel lets you save and use specific colors that you use often By default, the Swatches panel holds over 30 predefined color swatches, and has the ability to save as many user-defined swatches as you desire

Working with the

Swatches Panel

Add a Color Swatch to the

Swatches Panel

Select the Swatches panel.

Click the Swatches Options

button, and then choose from the

predefined color swatches

Click the Append button to add the

selected color swatch to the

panel

Change and Delete Colors on

the Swatches Panel

Select the Swatches panel.

Select a color, and then change

the following:

◆ Foreground Change the color

by clicking on any color in the

Swatches panel

◆ Background Change the color

by holding down the Ctrl (Win)

or A (Mac) key, and then

clicking on any color in the

Swatches panel

◆ Delete Hold down the Alt (Win)

or Option (Mac) key (your

cursor will turn into a pair of

scissors), and then click the

color in the Swatches panel

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Add Colors to the Swatches

Panel

Select the Color panel, and then

drag the sliders or enter values to

create a new color swatch

Select the Swatches panel, and

then drag the lower right corner to

expand its size beyond the range

of the available colors

Move the cursor just below the

last swatch color until it resembles

a paint bucket

Click once, name the color, and

then click OK.

Save Customized Swatch Panels

Select the Swatches panel.

Create a customized swatch panel

by adding and/or deleting colors

from an existing panel

Click the Swatches Options

button, and then click Save

Swatches.

Enter a name in the Save As box

Click the Save In (Win) or Where

(Mac) list arrow, and then select a

location to store the swatch

Click Save.

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Did You Know?

You can access your customized

swatches from the Swatches Options

button When you save swatches in the

Color Swatches folder (default

loca-tion), your customized swatches

appear at the bottom of the Swatches