Datasheet

Welcome to Adobe Photoshop CS4

Part I

FIGURE 1.10

CMYK mode channels

FIGURE 1.11

Lab mode channels

Grayscale mode. Black, white, and shades of gray are used to make up the “colors”

in an image (no hue is present). In 8-bpc images, there can be 256 brightness values.

Grayscale images’ values can be measured in a range from 0 (black) to 255 (white) or

with 0 percent–100 percent of black ink coverage.

Grayscale mode (see Figure 1.12) can be used when preparing images to be printed with

one color of ink. Grayscale images can be assigned a color within most page layout soft-

ware, such as InDesign or Quark Xpress.

FIGURE 1.12

Grayscale mode channels

Bitmap mode. Only black and white pixels are used. Bitmap mode images are 1-bpc

images (see Figure 1.13). They are often used for simple artwork that lends itself to

reproduction in only black and white pixels, sometimes called line art. Bitmap mode

images can be assigned a color within most page layout software, such as InDesign or

Quark Xpress.