A document originally intended for one output device is redirected to a different device in Java

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A document originally intended for one output device is redirected to a different device
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A document is intended to be compatible with viewer applications designed for
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earlier versions of PDF, and thus cannot specify CIE-based colors directly
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Color corrections or rendering intents need to be applied to device colors (see
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Rendering Intents on page 197) A color space is selected for painting each graphics object This is either the current color space parameter in the graphics state or a color space given as an entry in an image XObject, inline image, or shading dictionary Regardless of how the color space is speci ed, it may be subject to remapping as described below When a device color space is selected, the ColorSpace subdictionary of the current resource dictionary (see Section 372, Resource Dictionaries ) is checked for the presence of an entry designating a corresponding default color space (DefaultGray, DefaultRGB, or DefaultCMYK, corresponding to DeviceGray, DeviceRGB, or DeviceCMYK, respectively) If such an entry is present, its value is used as the color space for the operation currently being performed (If the view-
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er application does not recognize this color space, no remapping will occur; the original device color space will be used) Color values in the original device color space are passed unchanged to the default color space, which must have the same number of components as the original space The default color space should be chosen to be compatible with the original, taking into account the components ranges and whether the components are additive or subtractive If a color value lies outside the range of the default color space, it will be adjusted to the nearest valid value Note: Any color space other than a Lab, Indexed, or Pattern color space may be used as a default color space, provided that it is compatible with the original device color space as described above If the selected space is a special color space based on an underlying device color space, the default color space will be used in place of the underlying space This applies to the following:
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The underlying color space of a Pattern color space The base color space of an Indexed color space The alternate color space of a Separation or DeviceN color space (but only if
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the alternate color space is actually selected) See Section 455, Special Color Spaces, for details on these color spaces Note: Note that there is no conversion of color values, such as a tint transformation, when using the default color space Color values that are within the range of the device color space might not be within the range of the default color space (particularly if the default is an ICCBased color space) In this case, the nearest values within the range of the default space will be used For this reason, a Lab color space is not permitted as the DefaultRGB color space
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Implicit Conversion of CIE-Based Color Spaces
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In work ows in which PDF documents are intended for rendering on a speci c target output device (such as a printing press with particular inks and media), it is often useful to specify the source colors for some or all of a document s objects in a CIE-based color space that matches the calibration of the intended device The resulting document, while tailored to the speci c characteristics of the target
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device, remains device-independent and will produce reasonable results if retargeted to a different output device However, the expectation is that if the document is printed on the intended target device, source colors that have been speci ed in a color space matching the calibration of the device will pass through unchanged, without conversion to and from the intermediate CIE 1931 XYZ space as depicted in Figure 414 on page 182 In particular, when colors intended for a CMYK output device are speci ed in an ICCBased color space using a matching CMYK printing pro le, converting such colors from four components to three and back is unnecessary and will result in an undesirable loss of delity in the black component In such cases, PDF viewer applications may provide the ability for the user to specify a particular calibration to use for printing, proo ng, or previewing This calibration is then considered to be that of the native color space of the intended output device (typically DeviceCMYK), and colors expressed in a CIE-based source color space matching it can be treated as if they were speci ed directly in the device s native color space Note that the conditions under which such implicit conversion is done cannot be speci ed in PDF itself, since nothing in PDF describes the calibration of the output device (although an output intent dictionary, if present, may suggest such a calibration; see Section 9104, Output Intents ) The conversion is completely hidden by the viewer application and plays no part in the interpretation of PDF color spaces When this type of implicit conversion is done, all of the semantics of the device color space should also apply, even though they do not apply to CIE-based spaces in general In particular:
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The nonzero overprint mode (see Section 456, Overprint Control ) determines the interpretation of color component values in the space
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