HP DesignJet T795 Using your printer - Page 83
HP Professional PANTONE Emulation, Color emulation
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HP Professional PANTONE Emulation When you use a named PANTONE color in an image, your application will normally send to the printer a CMYK or RGB approximation to that color. But the application does not take the printer or the paper type into account, it merely produces a generic approximation of the PANTONE color, which will look different on different printers and on different papers. HP Professional PANTONE Emulation can do a much better job by taking into account the characteristics of the printer and the paper type. The results look as similar to the original PANTONE colors as is possible on a given printer using a given paper type. This technology is designed to produce emulations similar to those set up manually by prepress professionals. To use HP Professional PANTONE Emulation, all you have to do is to turn it on. In fact, it is normally on by default. ● In the Windows PostScript driver dialog: go to the Color tab and select HP Professional PANTONE Emulation. ● In the Mac OS PostScript Print dialog: go to the Color Options panel and select HP Professional PANTONE Emulation. You can also use the Embedded Web Server to print a swatch book showing emulations of PANTONE colors as made by your printer, together with a measure of the color difference (ΔE) between each emulation and the original PANTONE spot color. So HP Professional PANTONE Emulation not only provides the closest match that can be achieved on your printer; it also gives clear information on how close the emulation is to the original spot color. See Printing PANTONE swatch books (T1300 PS) on page 78. Color emulation Your printer can emulate the color behavior of other devices: RGB devices such as monitors, and CMYK devices such as presses and printers. You can set color emulation in the following ways: ● In the Windows PostScript driver dialog: select the Color tab, and Printer Managed Colors. ● In the Mac OS Print dialog: select the Color Options panel, then select Printer from the Color Management list. For a good emulation, the printer needs a specification of the colors these devices can reproduce. The standard way of encapsulating such information is in ICC profiles. As part of the solution, we provide the most common standards for the different devices. The options are as follows. CMYK color emulation A traditional workflow defines color in the CMYK space. For best results, the colors must be adjusted to the printer, because different printers will produce different colors from the same CMYK data. If the image file you are printing was not created specifically for your printer, it will require some readjustment, which can be done using one of the following options provided with your printer. ● None (Native): no emulation. The printer will use its default internal conversion from CMYK to RGB, without following any color standard. This does not imply that results will be bad ● ISO Coated 2-ECI is based on the characterization dataset FOGRA39L.txt, applicable to the following reference printing conditions according to the international standard ISO 12647-2:2004/Amd 1: commercial and specialty offset, paper type 1 and 2, gloss or matt coated paper, positive plates, tone value increase curves A (CMY) and B (K), white backing. ● Coated GRACoL 2006-ISO12647 provides GRACoL proofing and printing on Grade 1 coated paper, ISO 12647-2 Paper type 1. ENWW Color management from printer drivers (PostScript printers) 75