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624 Conversion from DeviceCMYK to DeviceRGB
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Conversion of a color value from CMYK to RGB is a simple operation that does not involve black generation or undercolor removal: red = 10 min (10, cyan + black) green = 10 min (10, magenta + black) blue = 10 min (10, yellow + black) In other words, the black component is simply added to each of the other components, which are then converted to their complementary colors by subtracting them each from 10
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In PDF 12, a transfer function adjusts the values of color components to compensate for nonlinear response in an output device and in the human eye Each component of a device color space for example, the red component of the DeviceRGB space is intended to represent the perceived lightness or intensity of that color component in proportion to the component s numeric value Many devices do not actually behave this way, however; the purpose of a transfer function is to compensate for the device s actual behavior This operation is sometimes called gamma correction (not to be confused with the CIE-based gamut mapping function performed as part of CIE-based color rendering) In the sequence of steps for processing colors, the viewer application applies the transfer function after performing any needed conversions between color spaces, but before applying a halftone function, if necessary Each color component has its own separate transfer function; there is no interaction between components Transfer functions always operate in the native color space of the output device, regardless of the color space in which colors were originally speci ed (For example, for a CMYK device, the transfer functions apply to the device s cyan, magenta, yellow, and black color components, even if the colors were originally speci ed in, say, a DeviceRGB or CalRGB color space) The transfer function is called with a numeric operand in the range 00 to 10 and must return a number in the same range The input is the value of a color component in the device s native color space, either speci ed directly or produced by conversion from some other color space The output is the transformed component value to be transmitted to the device (after halftoning, if necessary)
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Both the input and the output of a transfer function are always interpreted as if the corresponding color component were additive (red, green, blue, or gray): the greater the numeric value, the lighter the color If the component is subtractive (cyan, magenta, yellow, black, or a spot color), it is converted to additive form by subtracting it from 10 before it is passed to the transfer function The output of the function is always in additive form, and is passed on to the halftone function in that form In PDF 12, transfer functions are de ned as PDF function objects (see Section 39, Functions ) There are two ways to specify transfer functions:
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The current transfer function parameter in the graphics state consists of either a
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single transfer function or an array of four separate transfer functions, one each for red, green, blue, and gray or their complements cyan, magenta, yellow, and black (If only a single function is speci ed, it applies to all components) An RGB device uses the rst three; a monochrome device uses the gray transfer function only; and a CMYK device uses all four The current transfer function can be speci ed as the value of the TR or TR2 entry in a graphics state parameter dictionary; see Table 48 on page 157
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The current halftone parameter in the graphics state can specify transfer functions as optional entries in halftone dictionaries (see Section 644, Halftone Dictionaries ) This is the only way to set transfer functions for nonprimary color components, or for any component in devices whose native color space uses components other than the ones listed above A transfer function speci ed in a halftone dictionary overrides the corresponding one speci ed by the current transfer function parameter in the graphics state In addition to their intended use for gamma correction, transfer functions can be used to produce a variety of special, device-dependent effects For example, on a monochrome device, the PostScript calculator function
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inverts the output colors, producing a negative rendition of the page In general, this method does not work for color devices; inversion can be more complicated than merely inverting each of the components Because transfer functions produce device-dependent effects, a page description that is intended to be deviceindependent should not alter them
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