Color management
●CMS: CMS stands for Color Management System. It is the application that converts the color information stored in the input image, which has the color space defined by a source profile, into an output image that has the color space specified by a destination profile. There are many different CMSs on the market: there are CMSs in applications, in operating systems and in printing software provided by printer manufacturers (in our case the HP Designjet Z5200ps internal RIP).
●Source profile: a description of the color behavior of the input device.
●Destination profile: a description of the color behavior of the output device.
●Rendering intent: the most difficult challenge in color management is when a color in the source gamut does not correspond directly to a color in the destination gamut. As a perfect match is not possible, there are different types of choices that can be made about how to treat gamut differences and these are called rendering intent. There are four different possibilities depending on the final output you want to achieve.
◦Use Perceptual for the most pleasing final output from your original RGB image. It is suitable for photographic content.
◦Use Saturation for vivid final output. It is suitable for business graphics (charts, presentations, etc.), but is not recommended for color matching.
◦Use Relative Colorimetric for press proofing. This rendering intent provides a match for colors that are inside both the source and destination gamuts and minimizes differences when a match is not possible.
◦Use Absolute Colorimetric for press proofing (like Relative Colorimetric), when you also want to simulate the color of the source’s paper.
TIP: You can use "soft proofing" options in your application (such as Photoshop and InDesign) to view the result of each rendering intent. See Proof the output on the monitor (InDesign, PS driver) on page 91.
The most commonly used device color spaces and, therefore, profiles are:
●RGB mode:
◦sRGB (sRGB
◦Adobe RGB (1998): for images originating typically from professional digital cameras
◦Specific RGB device space: for images coming from or going to a specific RGB device that has been profiled. The HP Designjet Z5200ps has the capability to measure itself and
ENWW | The solution: color management 63 |
