Epson Color Managed Workflow Bedienungsanleitung PDF herunterladen (Seite 30)

Color management

Adobe Photoshop CS4 for Photographers

This chapter on Digital Capture is provided free with the Adobe Photoshop CS4 for Photographers book. Not for distribution or resale.

Working with Grayscale

Grayscale image ﬁles can also be managed via the Color

Settings dialog. The color management policy can be set to

either Preserve Embedded Proﬁles or Convert to Grayscale

workspace. If the proﬁle of the incoming grayscale ﬁle

does not match the current Gray workspace (and the ‘Ask

When Opening box is checked), you will be asked whether

you wish to use the tagged grayscale space proﬁle, or

convert to the current grayscale workspace.

If you examine the Gray workspace options, you will

see a list of dot gain percentages and monitor gamma

values. If you are preparing grayscale images for display

on a monitor such as on a website or in a multimedia

presentation then you will want to select Gray Gamma 2.2

(see the sidebar: Grayscale for screen display). If you want

to know how any existing prepress grayscale image will

look like on the Web as a grayscale image, select the View

➯ Proof Setup and choose Windows RGB or Macintosh

RGB. You can then select Image ➯ Adjust ➯ Levels and

adjust the Gamma slider accordingly to obtain the right

brightness for a typical PC or Mac display. If you are using

grayscale mode to make prints via the Advanced B&W

print options for an Epson printer, you should make sure

that the Grayscale workspace uses a gamma setting that

matches the gamma of your current RGB workspace. This

ensures there is no gamma compensation when you convert

from RGB to Grayscale (see sidebar: Matching grayscale

gamma)

For prepress work you should select the dot gain

percentage that most closely matches the anticipated dot

gain of the press. It is important to note that the Gray

workspace setting is independent of the CMYK workspace.

If you want the Gray workspace dot gain value to match the

black plate of the current CMYK setting, then mouse down

on the Gray setting and choose Load Gray... Now go to the

Proﬁles folder which will be in the Library/Application

Support/Adobe/Color/Settings folder on a Mac and in the

Program Files/Common Files/Adobe/Color/Settings folder

on a PC. Select the same CMYK space as you are using for

the CMYK color separations and click the Load button.

Grayscale for screen display

If you intend creating grayscale images to

be seen on the Internet or in multimedia

presentations, choose the Default Web

Graphics color setting. The Grayscale

workspace will then be set to a 2.2 gamma

space, which is the same gamma used

by the majority of PC computer screens.

The truth is, you can never be 100% sure

how anybody who views your work will

have their monitor calibrated, but you

can at least assume that the majority of

Internet users will have a PC monitor

set to a 2.2 gamma. The Macintosh 1.8

gamma setting should really be relegated

to ancient history. The reason it exists at

all is because in the very early days of the

Macintosh computer and before ICC color

management, a 1.8 gamma monitor space

most closely matched the dot gain of the

Apple monochrome laser printer.

Matching grayscale gamma

If you are using the Epson Advanced B&W

options to print from grayscale images, it

is best to make sure that the Gray working

space matches the gamma of the RGB

working space. If this is the case, use the

following Gray gamma settings:

Colormatch RGB: 1.8 gamma

Adobe RGB: 2.2 gamma

sRGB: 2.2 gamma

ProPhoto RGB: 1.8 gamma

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