Adobe photoshop cs2 Benutzerhandbuch
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ADOBE PHOTOSHOP CS2
User Guide
Use the CMYK mode when preparing an image to be printed using process colors. Converting an RGB image into
CMYK creates a color separation. If you start with an RGB image, it’s best to edit first in RGB and then convert to
CMYK at the end of your process. In RGB mode, you can use the Proof Setup commands to simulate the effects of a
CMYK conversion without changing the actual image data. You can also use CMYK mode to work directly with
CMYK images scanned or imported from high-end systems.
CMYK creates a color separation. If you start with an RGB image, it’s best to edit first in RGB and then convert to
CMYK at the end of your process. In RGB mode, you can use the Proof Setup commands to simulate the effects of a
CMYK conversion without changing the actual image data. You can also use CMYK mode to work directly with
CMYK images scanned or imported from high-end systems.
Although CMYK is a standard color model, the exact range of colors represented can vary, depending on the press
and printing conditions. Photoshop’s CMYK Color mode varies according to the working space setting that you
specify in the Color Settings dialog box.
and printing conditions. Photoshop’s CMYK Color mode varies according to the working space setting that you
specify in the Color Settings dialog box.
See also
Lab Color mode
The Lab Color mode has a lightness component (L) that can range from 0 to 100. In the Adobe Color Picker, the a
component (green-red axis) and the b component (blue-yellow axis) can range from +127 to –128. In the Color
palette, the a component and the b component can range from +127 to –128.
component (green-red axis) and the b component (blue-yellow axis) can range from +127 to –128. In the Color
palette, the a component and the b component can range from +127 to –128.
You can use Lab mode to work with Photo CD images, edit the luminance and the color values in an image indepen
dently, move images between systems, and print to PostScript Level 2 and Level 3 printers. To print Lab images to
other color PostScript devices, convert to CMYK first.
dently, move images between systems, and print to PostScript Level 2 and Level 3 printers. To print Lab images to
other color PostScript devices, convert to CMYK first.
Lab images can be saved in Photoshop, Photoshop EPS, Large Document Format (PSB), Photoshop PDF, Photoshop
Raw, TIFF, Photoshop DCS 1.0, or Photoshop DCS 2.0 formats. You can save 48-bit (16-bits-per-channel) Lab images
in Photoshop, Large Document Format (PSB), Photoshop PDF, Photoshop Raw, or TIFF formats.
Raw, TIFF, Photoshop DCS 1.0, or Photoshop DCS 2.0 formats. You can save 48-bit (16-bits-per-channel) Lab images
in Photoshop, Large Document Format (PSB), Photoshop PDF, Photoshop Raw, or TIFF formats.
Note: The DCS 1.0 and DCS 2.0 formats convert the file to CMYK when opened.
Lab color is the intermediate color model Photoshop uses when converting from one color mode to another.
Bitmap mode
Bitmap mode uses one of two color values (black or white) to represent the pixels in an image. Images in Bitmap
mode are called bitmapped 1-bit images because they have a bit depth of 1.
mode are called bitmapped 1-bit images because they have a bit depth of 1.
Grayscale mode
Grayscale mode uses different shades of gray in an image. In 8-bit images, there can be up to 256 shades of gray. Every
pixel of a grayscale image has a brightness value ranging from 0 (black) to 255 (white). In 16 and 32-bit images, the
number of shades in an image is much greater than in 8-bit images. Grayscale values can also be measured as
percentages of black ink coverage (0% is equal to white, 100% to black). Images produced using black-and-white or
grayscale scanners typically are displayed in Grayscale mode.
pixel of a grayscale image has a brightness value ranging from 0 (black) to 255 (white). In 16 and 32-bit images, the
number of shades in an image is much greater than in 8-bit images. Grayscale values can also be measured as
percentages of black ink coverage (0% is equal to white, 100% to black). Images produced using black-and-white or
grayscale scanners typically are displayed in Grayscale mode.
Although Grayscale is a standard color model, the exact range of grays represented can vary, depending on the
printing conditions. In Photoshop, Grayscale mode uses the range defined by the working space setting that you
specify in the Color Settings dialog box.
printing conditions. In Photoshop, Grayscale mode uses the range defined by the working space setting that you
specify in the Color Settings dialog box.