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PDF Oxide

PDF/X Print Production

PDF/X (ISO 15930) é o padrão para troca confiável de arquivos PDF prontos para impressao. PDF Oxide validates all major PDF/X levels, checking página boxes, color spaces, transparency, ICC profiles, and output intents.

Níveis Suportados

Level Standard Transparency RGB Layers External ICC External Graphics
X-1a:2001 ISO 15930-1 Não Não Não Não Não
X-1a:2003 ISO 15930-4 Não Não Não Não Não
X-3:2002 ISO 15930-3 Não Sim Não Não Não
X-3:2003 ISO 15930-6 Não Sim Não Não Não
X-4 ISO 15930-7 Sim Sim Sim Não Não
X-4p ISO 15930-7 Sim Sim Sim Sim Não
X-5g ISO 15930-8 Sim Sim Sim Não Sim
X-5n ISO 15930-8 Sim Sim Sim Não Sim
X-5pg ISO 15930-8 Sim Sim Sim Sim Sim
X-6 ISO 15930-9 Sim Sim Sim Não Não
X-6n ISO 15930-9 Sim Sim Sim Não Sim
X-6p ISO 15930-9 Sim Sim Sim Sim Não

PDF/X-1a is the most restrictive: CMYK-only, sem transparência, no layers. PDF/X-4 is the most commonly used modern level, allowing transparency and RGB with ICC profiles.

Validação Rápida

from pdf_oxide import PdfDocument

doc = PdfDocument("document.pdf")
result = doc.validate_pdf_x("4")
print(f"Valid: {result.valid}")

use pdf_oxide::PdfDocument;
use pdf_oxide::compliance::pdf_x::{validate_pdf_x, PdfXLevel};

let mut doc = PdfDocument::open("print-ready.pdf")?;
let result = validate_pdf_x(&mut doc, PdfXLevel::X4)?;

if result.has_errors() {
    println!("Not PDF/X-4 compliant ({} errors):", result.errors.len());
    for error in &result.errors {
        println!("  [{}] {} (clause {})",
            error.code, error.message,
            error.clause.as_deref().unwrap_or("n/a"));
    }
} else {
    println!("Document is PDF/X-4 compliant");
}

API do Validador

O builder PdfXValidator configura a execução da validação:

use pdf_oxide::PdfDocument;
use pdf_oxide::compliance::pdf_x::{PdfXValidator, PdfXLevel};

let mut doc = PdfDocument::open("artwork.pdf")?;

let result = PdfXValidator::new(PdfXLevel::X1a2001)
    .stop_on_first_error(false)
    .include_warnings(true)
    .validate(&mut doc)?;

println!("Errors: {}", result.errors.len());
println!("Warnings: {}", result.warnings.len());
println!("Total issues: {}", result.total_issues());

O Que e Verificado

XMP Identification

O validador confirma que os metadados XMP declaram a versão correta do PDF/X:

  • pdfxid:GTS_PDFXVersion must match the target level
  • The declared version is compared against the gts_pdfx_version() for the target level

Página Box Relationships

PDF/X requires specific nesting of página boxes:

TrimBox <= BleedBox <= MediaBox
ArtBox  <= MediaBox

O validador verifica cada página para garantir:

  • TrimBox is present (required by all PDF/X levels)
  • TrimBox is contained within BleedBox (if BleedBox is defined)
  • BleedBox is contained within MediaBox
  • ArtBox is contained within MediaBox (if ArtBox is defined)
  • Tolerance of 0.01 points for floating-point rounding

Transparency Detection

Para PDF/X-1a and PDF/X-3, sem transparência is permitted. The validator checks:

  • SMask in ExtGState dictionaries (must be /None or absent)
  • CA (stroke opacity) must equal 1.0
  • ca (fill opacity) must equal 1.0
  • BM (blend mode) must be Normal or Compatible

PDF/X-4 and later levels permit transparency.

Color Space Validation

O validador verifica o uso de cores dependentes de dispositivo:

  • DeviceRGB is not allowed in PDF/X-1a (CMYK-only)
  • DeviceRGB, DeviceCMYK, and DeviceGray used without an output intent trigger errors in stricter levels
  • Color operators rg, RG, k, K, g, G in página content streams are scanned

ICC Profile Validation

Para ICCBased color spaces, the validator checks:

  • The profile stream contains the required /N (number of components) entry
  • The /N value matches the expected color space dimension (1 for gray, 3 for RGB, 4 for CMYK)
  • The profile data is present and non-empty

Output Intent

PDF/X requires an output intent that describes the intended print condition:

  • /OutputIntents array must be present in the document catalog
  • At least one entry with subtype GTS_PDFX is required
  • The output intent should reference an ICC profile or a registered print condition

XValidationResult

pub struct XValidationResult {
    pub level: PdfXLevel,
    pub errors: Vec<XComplianceError>,
    pub warnings: Vec<XComplianceError>,
    pub stats: XValidationStats,
}

XComplianceError

pub struct XComplianceError {
    pub code: XErrorCode,
    pub message: String,
    pub severity: XSeverity,
    pub page: Option<usize>,
    pub object_id: Option<u32>,
    pub clause: Option<String>,
}

Errors include the página number and object ID where the violation was found, making it straightforward to locate and fix issues in the source file.

XErrorCode Categories

O enum XErrorCode contém mais de 40 códigos de erro específicos organizados por categoria:

Metadata: MissingOutputIntent, InvalidGtsPdfxVersion, MissingXmpIdentification

Page boxes: MissingTrimBox, TrimBoxOutsideBleedBox, BleedBoxOutsideMediaBox, ArtBoxOutsideMediaBox

Transparency: TransparencyNotAllowed, InvalidBlendMode, InvalidSMask, InvalidOpacity

Color: DeviceRgbNotAllowed, DeviceDependentColorWithoutIntent, InvalidIccProfile, MissingIccComponents

Content: ExternalContentNotAllowed, CriptografiaNotAllowed, JavaScriptNotAllowed

Métodos PdfXLevel

Método Retorno Descrição
iso_standard() &str ISO standard number (e.g., "ISO 15930-7")
required_pdf_version() &str Minimum Versão do PDF (e.g., "1.6")
allows_transparency() bool Whether transparency groups are permitted
allows_rgb() bool Whether Cor RGB space is permitted
allows_layers() bool Whether optional content groups are permitted
allows_external_icc() bool Whether external ICC profiles are permitted
allows_external_graphics() bool Whether external graphics references are permitted
gts_pdfx_version() &str Expected GTS_PDFXVersion value
xmp_version() &str Expected XMP version identifier
from_gts_version(version) Option<Self> Parse level from a GTS version string

Exemplo Pratico: Prepress Check

use pdf_oxide::PdfDocument;
use pdf_oxide::compliance::pdf_x::{validate_pdf_x, PdfXLevel, XSeverity};

let mut doc = PdfDocument::open("magazine-cover.pdf")?;
let result = validate_pdf_x(&mut doc, PdfXLevel::X4)?;

println!("=== PDF/X-4 Prepress Report ===");
println!("Status: {}", if result.has_errors() { "REJECT" } else { "ACCEPT" });

// Group errors by severity
let critical: Vec<_> = result.errors.iter()
    .filter(|e| e.is_error())
    .collect();
let advisory: Vec<_> = result.warnings.iter().collect();

if !critical.is_empty() {
    println!("\nCritical ({}):", critical.len());
    for e in &critical {
        let page_str = e.page
            .map(|p| format!("page {}", p + 1))
            .unwrap_or_else(|| "document".into());
        println!("  [{}] {} ({})", e.code, e.message, page_str);
    }
}

if !advisory.is_empty() {
    println!("\nAdvisory ({}):", advisory.len());
    for w in &advisory {
        println!("  [{}] {}", w.code, w.message);
    }
}

Próximos Passos