Adobe photoshop cs2 Manual De Usuario

ADOBE PHOTOSHOP CS2 

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. 

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. 

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. 

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. 

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. 

Lab color is the intermediate color model Photoshop uses when converting from one color mode to another. 

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. 

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. 

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.