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The graphics state contains an overprint parameter, controlled by the OP and op entries in a graphics state parameter dictionary Overprint control is useful mainly on devices that produce true physical separations, but it is available on some
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composite devices as well Although the operation of this parameter is devicedependent, it is described here, rather than in the chapter on color rendering, because it pertains to an aspect of painting in device color spaces that is important to many applications Any painting operation marks some speci c set of device colorants, depending on the color space in which the painting takes place In a Separation or DeviceN color space, the colorants to be marked are speci ed explicitly; in a device or CIEbased color space, they are implied by the process color model of the output device (see 6) The overprint parameter is a boolean ag that determines how painting operations affect colorants other than those explicitly or implicitly speci ed by the current color space If the overprint parameter is false (the default value), painting a color in any color space causes the corresponding areas of unspeci ed colorants to be erased (painted with a tint value of 00) The effect is that the color at any position on the page is whatever was painted there last; this is consistent with the normal painting behavior of the opaque imaging model If the overprint parameter is true and the output device supports overprinting, no such erasing actions are performed; anything previously painted in other colorants is left undisturbed Consequently, the color at a given position on the page may be a combined result of several painting operations in different colorants The effect produced by such overprinting is device-dependent and is not de ned by the PDF language Note: Not all devices support overprinting Furthermore, many PostScript printers support it only when separations are being produced, and not for composite output If overprinting is not supported, the value of the overprint parameter is ignored An additional graphics state parameter, the overprint mode (PDF 13), affects the interpretation of a tint value of 00 for a color component in a DeviceCMYK color space when overprinting is enabled This parameter is controlled by the OPM entry in a graphics state parameter dictionary; it has an effect only when the overprint parameter is true, as described above When colors are speci ed in a DeviceCMYK color space and the native color space of the output device is also DeviceCMYK, each of the source color components controls the corresponding device colorant directly Ordinarily, each source color component value replaces the value previously painted for the corresponding de-
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vice colorant, no matter what the new value is; this is the default behavior, speci ed by overprint mode 0 When the overprint mode is 1 (also called nonzero overprint mode), a tint value of 00 for a source color component leaves the corresponding component of the previously painted color unchanged The effect is equivalent to painting in a DeviceN color space that includes only those components whose values are nonzero For example, if the overprint parameter is true and the overprint mode is 1, the operation
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in the color space shown in Example 418
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Example 418 10 0 obj [ /DeviceN [/Cyan /Magenta /Black] /DeviceCMYK 15 0 R ] endobj 15 0 obj << /FunctionType 4 /Domain [00 10 00 10 00 10] /Range [00 10 00 10 00 10 00 10] /Length 13 >> stream {0 exch} endstream endobj % Color space
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Nonzero overprint mode applies only to painting operations that use the current color in the graphics state when the current color space is DeviceCMYK It does not apply to the painting of images or to any colors that are the result of a computation, such as those in a shading pattern or conversions from some other
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