Digital printing refers to methods of printing from a digital-based image directly to a variety of media.[ It usually refers to professional printing where small-run jobs from desktop publishing and other digital sources are printed using large-format and/or high-volume laser or inkjet printers
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| MORDERN DIGITAL PRINTING MATCHINE \After your image is sized and sharpened, it’s ready for you to make a print. To this point, you’ve been working with a backlit display with vivid RGB colors that exceed the saturation and brightness of anything you can put on paper. Now the moment of truth arrives, and you need to translate what you see on the monitor to a print that can convey the same feeling. The problem is much the same as it was when photographers shot transparency film: There’s still a huge discrepancy between the dynamic range and color gamut that can be represented with a glowing backlit monitor image and what can be printed on paper, where the brightest thing is the white paper. Another major issue is the way images are constructed in the two different media. RGB images on the monitor exist in an additive color space: Red, green and blue light is added together to make white. CMYK images, which form the bulk of paper-based output, use cyan, magenta, yellow and black to subtract fr |
Typically, all of our corrections and edits are made in RGB, and the majority of printed outputs are in CMYK. This includes desktop inkjet printers that are designed to receive RGB files. These printers internally transform RGB input into some kind of CcMmYKk-type color for the specific ink set that the printer uses. Even true RGB output devices, such as a LightJet printer, don’t actually have a standard RGB workspace color gamut. There-fore, all prints require a color transformation to occur from the workspace (editing color space) to the output (printing color space) for optimum results. All such transformations are handled by the
color management system.
Photoshop uses ICC (Inter-national Color Consortium) profiles to manage color inside the application. Effective color management requires profiles that describe every device used in the image creation workflow from workspace to monitor to printer. I select default profiles for my RGB workspace and CMYK workspace in Photoshop color settings. Frequently, the default CMYK workspace is used for generic CMYK output. Ideally, the color transformations necessary for printing to a specific printer utilize a profile for that specific device. Fortunately, most of the modern desktop printers provide reasonable profiles that are installed with the device drivers, and we can use these profiles to control the color transforms for printing.
Soft Proofing
Photoshop includes a method for previsualizing the effect that gamut reduction in the output has on the image. You can find this preview, often referred to as a soft proof, under the View menu. Select Proof Colors under the View menu or press Command + Y/Ctrl + Y to toggle the soft proof on or off. This changes the screen to simulate the appearance of the print. The default proof color is Working CMYK; you can select your CMYK color space in Photoshop Color Settings (Figure 1).
. Digital printing has a higher cost per page than more traditional offset printing methods, but this price is usually offset by avoiding the cost of all the technical steps required to make printing plates. It also allows for on-demand printing, short turnaround time, and even a modification of the image (variable data) used for each impression.
The savings in labor and the ever-increasing capability of digital presses means that digital printing is reaching the point where it can match or supersede offset printing technology's ability to produce larger print runs of several thousand sheets at a low price.
ou can change the proof colors to match the output you’re going to use. Go to View > Proof Setup > Custom. You’ll get a dialog that allows you to select a profile for a printer and a rendering intent for your transformation (Figure 2). You can select any output profile you want; you aren’t restricted to working with CMYK or any of the default selections such as Monitor RGB or Windows/Macintosh RGB. If you have a profile for an Epson printer, you can select it here. Select View > Proof Setup to change the output device you want to simulat
The Simulate check boxes at the bottom of this dialog are particularly interesting. The Simulate options allow you to see a more accurate preview and force an absolute color match to the screen. However, evaluating the color this way requires a little practice. When you select Proof Setup and check the Preview box, you might observe a very slight change in appearance, depending on the color gamut of the original. Normally, you’ll see very little change.
When you select Ink Black, the preview changes to reflect the actual intensity of the black ink on the paper to be printed. This can make the image seem a little dull, but it still isn’t entirely accurate. To be accurate, you need to select Paper White. This often results in a very dull renditio
Digital printing has many advantages over traditional methods. Some applications of note include:
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| HIGH QUALITY RESOLUTION FOR BETTER PRINTING OUTPUT! |
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| DIGITAL PRINTING OUTPUT |
Soft Proofing
Photoshop includes a method for previsualizing the effect that gamut reduction in the output has on the image. You can find this preview, often referred to as a soft proof, under the View menu. Select Proof Colors under the View menu or press Command + Y/Ctrl + Y to toggle the soft proof on or off. This changes the screen to simulate the appearance of the print. The default proof color is Working CMYK; you can select your CMYK color space in Photoshop Color Settings (Figure 1).
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| NEW VARIETY OF DIGITAL PRINTING MACHINE |
. Digital printing has a higher cost per page than more traditional offset printing methods, but this price is usually offset by avoiding the cost of all the technical steps required to make printing plates. It also allows for on-demand printing, short turnaround time, and even a modification of the image (variable data) used for each impression.
Digital images are exposed onto true, light sensitive photographic paper with lasers and processed in photographic developers and fixers. These prints are true photographs and have continuous tone in the image detail. The archival quality of the print is as high as the manufacturer's rating for any given photo paper used. In large format prints, the greatest advantage is that, since no lens is used, there is no vignetting or detail distortion in the corners of the image.
Digital printing technology has grown significantly over the past few years with substantial developments in quality and sheet sizes.
The Simulate check boxes at the bottom of this dialog are particularly interesting. The Simulate options allow you to see a more accurate preview and force an absolute color match to the screen. However, evaluating the color this way requires a little practice. When you select Proof Setup and check the Preview box, you might observe a very slight change in appearance, depending on the color gamut of the original. Normally, you’ll see very little change.
When you select Ink Black, the preview changes to reflect the actual intensity of the black ink on the paper to be printed. This can make the image seem a little dull, but it still isn’t entirely accurate. To be accurate, you need to select Paper White. This often results in a very dull renditio
Digital printing has many advantages over traditional methods. Some applications of note include:
- Desktop publishing – inexpensive home and office printing is only possible because of digital processes that bypass the need for printing plates
- Variable data printing – uses database-driven print files for the mass personalization of printed materials
- Fine art – archival digital printing methods include real photo paper exposure prints and giclée prints on watercolor paper using pigment based inks.
- Print on Demand – digital printing is used for personalized printing for example, children's books customized with a child's name, photo books (such as wedding photo books), or any other short run books of varying page quantities and binding techniques.
- Advertising – often used for outdoor banner advertising and event signage, in trade shows, in the retail sector at point of sale or point of purchase, and in personalized direct mail campaigns.
- Photos – digital printing has revolutionized photo printing in terms of the ability to retouch and color correct a photograph before printing.
- Architectural Design – new media that conforms to a variety of surfaces has enabled interior and exterior spaces to be transformed using digitally printed wall murals and floor graphics.
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