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Graphics
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TABLE 433 Data values in a tensor-product patch mesh
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EDGE FLAG NEXT SET OF DATA VALUES
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x00 y00 x01 y01 x02 y02 x03 y03 x13 y13 x23 y23 x33 y33 x32 y32 x31 y31 x30 y30 x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21 c00 c03 c33 c30 New patch; no implicit values
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x13 y13 x23 y23 x33 y33 x32 y32 x31 y31 x30 y30 x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21 c33 c30 Implicit values: (x00 , y00 ) = (x03 , y03 ) previous (x01 , y01 ) = (x13 , y13 ) previous (x02 , y02 ) = (x23 , y23 ) previous (x03 , y03 ) = (x33 , y33 ) previous c00 = c03 previous c03 = c33 previous
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x13 y13 x23 y23 x33 y33 x32 y32 x31 y31 x30 y30 x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21 c33 c30 Implicit values: (x00 , y00 ) = (x33 , y33 ) previous (x01 , y01 ) = (x32 , y32 ) previous (x02 , y02 ) = (x31 , y31 ) previous (x03 , y03 ) = (x30 , y30 ) previous c00 = c33 previous c03 = c30 previous
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x13 y13 x23 y23 x33 y33 x32 y32 x31 y31 x30 y30 x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21 c33 c30 Implicit values: (x00 , y00 ) = (x30 , y30 ) previous (x01 , y01 ) = (x20 , y20 ) previous (x02 , y02 ) = (x10 , y10 ) previous (x03 , y03 ) = (x00 , y00 ) previous c00 = c30 previous c03 = c00 previous
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S E CTIO N 4 7
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External Objects
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47 External Objects
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An external object (commonly called an XObject) is a graphics object whose contents are de ned by a self-contained content stream, separate from the content stream in which it is used There are three types of external object:
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An image XObject (Section 484, Image Dictionaries ) represents a sampled
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visual image such as a photograph
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A form XObject (Section 49, Form XObjects ) is a self-contained description
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of an arbitrary sequence of graphics objects
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A PostScript XObject (Section 410, PostScript XObjects ) contains a fragment
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of code expressed in the PostScript page description language Two further categories of external objects, group XObjects and reference XObjects (both PDF 14), are actually specialized types of form XObject with additional properties; see Sections 492, Group XObjects, and 493, Reference XObjects, for additional information Any XObject can be painted as part of another content stream by means of the Do operator (see Table 434) This operator applies to any type of XObject image, form, or PostScript The syntax is the same in all cases, although details of the operator s behavior differ depending on the type (See implementation note 34 in Appendix H)
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TABLE 434 XObject operator
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OPERANDS OPERATOR DESCRIPTION
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name
Paint the speci ed XObject The operand name must appear as a key in the XObject subdictionary of the current resource dictionary (see Section 372, Resource Dictionaries ); the associated value must be a stream whose Type entry, if present, is XObject The effect of Do depends on the value of the XObject s Subtype entry, which may be Image (see Section 484, Image Dictionaries ), Form (Section 49, Form XObjects ), or PS (Section 410, PostScript XObjects )
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Graphics
48 Images
PDF s painting operators include general facilities for dealing with sampled images A sampled image (or just image for short) is a rectangular array of sample values, each representing a color The image may approximate the appearance of some natural scene obtained through an input scanner or a video camera, or it may be generated synthetically
FIGURE 425 Typical sampled image
An image is de ned by a sequence of samples obtained by scanning the image array in row or column order Each sample in the array consists of as many color components as are needed for the color space in which they are speci ed for example, one component for DeviceGray, three for DeviceRGB, four for DeviceCMYK, or whatever number is required by a particular DeviceN space Each component is a 1-, 2-, 4-, or 8-bit integer, permitting the representation of 2, 4, 16, or 256 distinct values for each component PDF provides two means for specifying images: