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PDF20 Spec 08 XObjects
Part of: PDF20-Spec-08-Graphics
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8.8
𝑐00 = 𝑐03 previous 𝑐03 = 𝑐33 previous
𝑓=2
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 𝑐00 = 𝑐33 previous (𝑥01 , 𝑦01 ) = (𝑥32 , 𝑦32 ) previous 𝑐03 = 𝑐30 previous (𝑥02 , 𝑦02 ) = (𝑥31 , 𝑦31 ) previous (𝑥03 , 𝑦03 ) = (𝑥30 , 𝑦30 ) previous
𝑓=3
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 𝑐00 = 𝑐30 previous (𝑥01 , 𝑦01 ) = (𝑥20 , 𝑦20 ) previous 𝑐03 = 𝑐00 previous (𝑥02 , 𝑦02 ) = (𝑥10 , 𝑦10 ) previous (𝑥03 , 𝑦03 ) = (𝑥00 , 𝑦00 ) previous
External objects
8.8.1 General An external object (commonly called an XObject) is a graphics object whose contents are defined by a self-contained stream, separate from the content stream in which it is used. There are two types of external objects: •
An image XObject (8.9.5, "Image dictionaries") represents a sampled visual image such as a photograph.
•
A form XObject (8.10, "Form XObjects") is a self-contained description of an arbitrary sequence of graphics objects.
Two further categories of external objects, group XObjects and reference XObjects (both PDF 1.4), are © ISO 2020 – All rights reserved 253
ISO 32000-2:2020(E)
actually specialised types of form XObjects with additional properties. See 8.10.3, "Group XObjects" and 8.10.4, "Reference XObjects" for additional information. Any XObject can be painted as part of another content stream by means of the Do operator (see "Table 86 — XObject operator"). This operator applies to any type of XObject — image or form. The syntax is the same in all cases, although details of the operator’s behaviour differ depending on the type. Table 86 — XObject operator Operands
Operator
Description
name
Do
Paint the specified XObject. The operand name shall appear as a key in the XObject subdictionary of the current resource dictionary (see 7.8.3, "Resource dictionaries"). The associated value shall 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 8.9.5, "Image dictionaries") or Form (see 8.10, "Form XObjects").
Annex J, "XObject comparison", contains one method by which XObjects can be compared for equivalency.
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