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Chapter 6. Rendering > CIE-Based Color to Device Color

6.1. CIE-Based Color to Device Color

To render CIE-based colors on an output device, the consumer application must convert from the specified CIE-based color space to the device's native color space (typically DeviceGray, DeviceRGB, or DeviceCMYK), taking into account the known properties of the device. As discussed in Section 4.5.4, “CIE-Based Color Spaces,” CIE-based color is based on a model of human color perception. The goal of CIE-based color rendering is to produce output in the device's native color space that accurately reproduces the requested CIE-based color values as perceived by a human observer. CIE-based color specification and rendering are a feature of PDF 1.1 (CalGray, CalRGB, and Lab) and PDF 1.3 (ICCBased).

The conversion from CIE-based color to device color is complex, and the theory on which it is based is beyond the scope of this book; see the Bibliography for sources of further information. The algorithm has many parameters, including an optional, full three-dimensional color lookup table. The color fidelity of the output depends on having these parameters properly set, usually by a method that includes some form of calibration. The colors that a device can produce are characterized by a device profile, which is usually specified by an ICC profile associated with the device (and entirely separate from the profile that is specified in an ICCBased color space).


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