Printing From Photoshop; About Desktop Printing; Chapter 24: Printing - Adobe PHOTOSHOP CS2 User Manual

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Chapter 24: Printing

Printing from Photoshop

About printing
Printing is the process of sending your image to an output device. You can print on paper or film (positive or
negative), to a printing plate, or directly to a digital printing press. Whether you are printing an image on your
desktop printer or sending it to a prepress facility, knowing a few basics about printing makes the print job go more
smoothly and helps ensure that the finished image appears as intended.
For many Photoshop users, printing a file means sending the image to an inkjet printer.
Types of printing
Photoshop can send your image to a variety of devices to be printed directly onto paper or converted to a positive or
negative image on film. In the latter case, you can use the film to create a master plate for printing by a mechanical
press.
The simplest images, such as line art, use only one color in one level of gray. A more complex
Types of images
image, such as a photograph, has varying color tones. This type of image is known as a continuous-tone image.
Halftoning To create the illusion of continuous tones in images, printers break images down into dots. For photos
printed on a printing press, this process is called halftoning. Varying the sizes of the dots in a halftone screen creates
the optical illusion of variations of gray or continuous color in the image.
Note: Although inkjet printers also use dots to create the illusion of continuous tones, those dots are of uniform size and
much smaller than the dots used by most printing presses.
Color separation Artwork intended for commercial reproduction and containing more than one color must be
printed on separate master plates, one for each color. This process, called color separation, generally calls for the use
of cyan, yellow, magenta, and black (CMYK) inks. In Photoshop, you can adjust how the various plates are generated.
Quality of detail The detail in a printed image depends on its resolution and screen frequency. The higher the
resolution of an output device, the finer (higher) a screen ruling (lines per inch) you can use. Many inkjet printer
drivers offer simplified print settings for higher quality printing.

About desktop printing

Unless you work in a commercial printing company or service bureau, you probably print images on a desktop
printer, such as an inkjet, dye sublimation, or laser printer, and not to an imagesetter. Photoshop lets you control how
your image is printed.