Adobe 5.5 Design Standard User Manual download pdf (Page 62)

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Adobe Creative Suite 5 Printing Guide 60

If part of your workflow consists of printing to inkjet printers, you

should keep images in RGB: Even though inkjet printers image with

cyan, magenta, yellow, black (and often additional colors), they expect

an RGB print stream and can more faithfully render the image if it is not

in CMYK. This may seem counterintuitive, but these devices perform

their own conversions, geared toward the capabilities of their particular

dyes or pigments.

Even if you will ultimately image to a platesetter, there are advantages

to the large color gamut available in the RGB color mode; if your

workflow supports it, keep images in the RGB color mode as long as

possible to avoid premature loss of color data. Some color corrections

are easier in RGB (such as setting neutral points) and many Photoshop

filters do not work in CMYK.

CMYK

If you prefer to receive CMYK images, but your customer has supplied

images in another color space, such as RGB or Lab, you must decide

whether to convert the images to CMYK yourself, or rely on the color-

conversion function of your RIP. In-RIP color conversions from many

vendors are more predictable than in the past, but if you prefer to make

your own conversions, it’s important to know how to control the

conversion to CMYK in Photoshop.

When converting between color modes, Photoshop uses the color

settings currently in effect. If you have a custom profile for the intended

target (such as your press), you should choose that in your color

settings. If you prefer to receive CMYK images from your customers,

supply them with your preferred settings to ensure that they send

images that are appropriate for your workflow.

Special case: Screen captures

Screen captures benefit from special handling when converting from

RGB to CMYK. Create a special Gray Component Replacement (GCR)

separation setup that generates a maximum black, replacing all four-

color grays and blacks with shades of process black. This prevents small

black text (and the gray backgrounds commonly found in software

screens) from becoming a four-color black, thus minimizing blurring or

color casts on press. To create the custom separation setup:

1. Choose Edit > Color Seings.

2. In the Working Spaces area of the dialog box, choose Custom

CMYK from the CMYK

pop-up menu.

3. In the Custom CMYK dialog box, choose GCR for the Separation

Type.

4. For Black Generation, choose Maximum from the pop-up menu.

Look closely at the Gray Ramp diagram; wherever the image con-

tains equal levels of red, green and blue (which constitutes a neu-

tral gray in RGB images), those areas will be replaced with shades

of black, with no cyan, magenta, or yellow ink in those areas.

5. Type a name for the custom CMYK separation recipe (or accept the

name that Photoshop generates for you), and click OK. is returns

you to the Color Seings dialog box.

Screen Captures

Create a custom CMYK working space that uses GCR and a Maximum Black Generation to

replace all four-color gray and black content with shades of process black. Use this custom

separation setup when converting screen captures from RGB to CMYK.

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Adobe 5.5 Design Standard User Manual Page 62

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