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PDF/A-1 Compliance Issues

For each PDF/A-1 validation issue we try to explain what it means and, if possible how to resolve it. For a more technical explanation of the issue we quote the related section of the ISO 19005-1 PDF/A Specification.

6.1
File Structure - General
6.1.2
File Header
6.1.3
File Trailer
6.1.4
Cross Reference Table
6.1.6
String Objects
6.1.7
Stream Objects
6.1.8
Indirect Objects
6.1.10
Filters
6.1.11
Embedded Files
6.1.12
Implementation Limits
6.1.13
Optional Content
6.2.2
Output Intent
6.2.3
Color Spaces - General
6.2.3.3
Uncalibrated Color Spaces
6.2.3.4
Separation and DeviceN Color Spaces
6.2.4
Images
6.2.5
Form XObjects
6.2.6
Reference XObjects
6.2.7
PostScript XObjects
6.2.8
Extended Graphics State
6.2.9
Rendering Intents
6.2.10
Content Streams
6.3.2
Font Types
6.3.3.1
General Font Issues
6.3.3.2
CIDFonts
6.3.3.3
CMaps
6.3.4
Embedded Font Programs
6.3.5
Font Subsets
6.3.6
Font Metrics
6.3.7
Character Encodings
6.3.8
Unicode Character Maps
6.4
Transparency
6.5.2
Annotation Types
6.5.3
Annotation Dictionaries
6.6.1
General Multimedia Content
6.6.2
Trigger Events
6.7
Metadata
6.7.2
Properties
6.7.3
Document Information Dictionary
6.7.5
XMP Header
6.7.8
Extension Schemas
6.7.9
Validation
6.7.11
Version and Conformance Level Identification
6.8.2.2
Mark information dictionary
6.8.3.3
Structure hierarchy
6.8.3.4
Structure types
6.9
Interactive Forms
TN0001
TechNote : Namespaces
TN0003
TechNote - Metadata
TN0008
Predefined XMP Properties
TN0008-2.2
XMP Basic Schema
TN0009
XMP Extension Schemas
TN0009-3.3
Unqualified RDF Attributes

Compliance Issue: Annotation Dictionaries

What does this mean?

Value "1" for the key <<CA>> is required
The key <<F>> is required for PDF/A-1b
Flag "4" is required for the key <<F>>
Flag "35" is required for the key <<F>>
Using <<C>> key requires OutputIntent
Using <<IC>> key requires OutputIntent
Original color space "DeviceCMYK" replaced with "DeviceRGB"
Device-specific color space used with incorrect or missing OutputIntent
The key <<D>> is prohibited for PDF/A-1b
The key <<R>> is prohibited for PDF/A-1b
The key <<N>> is required for PDF/A-1b
PDF type "dictionary" is prohibited for the key <<N>>

6.5.3 - ISO 19005-1 PDF/A Specification:

An annotation dictionary shall not contain the CA key with a value other than 1.0.

An annotation dictionary shall contain the F key. The F key’s Print flag bit shall be set to 1 and its Hidden, Invisible and NoView flag bits shall be set to 0.

Text annotations should set the NoZoom and NoRotate flag bits of the F key to 1.

NOTE 1: The restrictions on annotation flags prevent the use of annotations that are hidden or that are viewable but not printable. The NoZoom and NoRotate flags are permitted, which allows the use of annotation types that have the same behaviour as the commonly-used text annotation type. By definition, text annotations exhibit the NoZoom and NoRotate behaviour even if the flags are not set, as described in PDF Reference 8.4.5; explicitly setting these flags removes any potential ambiguity between the annotation dictionary settings and reader behaviour.

An annotation dictionary shall not contain the C array or the IC array unless the colour space of the DestOutputProfile in the PDF/A-1 OutputIntent dictionary, defined in 6.2.2, is RGB.

NOTE 2: These provisions ensure that the device colour spaces used in annotations by mechanisms other than an appearance stream are indirectly defined by means of the PDF/A-1 OutputIntent.

If an annotation dictionary contains the AP key, the appearance dictionary that it defines as its value shall contain only the N key, whose value shall be a stream defining the appearance of the annotation.

NOTE 3: All of the provisions of 6.5.3 apply to all annotation types, including the Widget type used for form fields.

 


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