GB/T 27935.1-2016 in English
VALIDGraphic technology―Prepress digital data exchange―Use of PDF―Part 1:Complete exchange using CMYK data(PDF/X-1 and PDF/X-1a)
- Issued on:2016-12-13
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$272.00
《GB/T 27935.1-2016印刷技术 印前数据交换 PDF的使用 第1部分：使用CMYK数据的完整数据交换（PDF/X-1和PDF/X-1a）》由TC170（全国印刷标准化技术委员会）归口，主管部门为国家新闻出版署(国家版权局)。
Introduction
Evolution of the Standard Framework for Printing Data Exchange
| Standard Version | Core Technical Features | Applicable Scenarios |
|---|---|---|
| PDF/X-1:2001 | Based on PDF1.3, allowing OPI indexing and encryption | Conventional CMYK printing process |
| PDF/X-1a:2001 | Disable OPI and encryption technology | Simplify printing workflow |
| ANSI CGATS.12/1-1999 | Early version based on PDF1.2 | Historical File Compatibility |
Core Technical Specification Analysis
1. Color Space Management
The standard requires that all printed elements must use DeviceCMYK, DeviceGray or spot color space:
- Separation Color Space: DeviceCMYK/Gray must be specified as a backup space
- Indexed Color Space: The basic space is limited to the printing color system
- Output Intent: Must contain a characteristic printing condition identifier
Application Case: Packaging Printing Spot Color Processing
When a cosmetic packaging uses Pantone spot colors, it is necessary to DeviceCMYK
Implementation Suggestions
1. File Generation Specifications
- Use TrimBox instead of ArtBox to define the finished product size
- Ensure that the Trapped tag accurately reflects the trapping status
- Avoid using PostScript XObject and BX/EX operators
2. Compatibility Guarantee
- PDF/X-1 readers should be backward compatible with ANSI CGATS.12/1-1999
- Encrypted files require an empty password (U='') and print permission bit (P=4)
- TIFF/IT-CT/P1 is the recommended format for CMYK data
3. Prepress Check Points
| Check Items | PDF/X-1 | PDF/X-1a |
|---|---|---|
| GTS_PDFXVersion | Required | Required |
| OPI Index | Allowed | Prohibited |
| Encrypt Dictionary | Optional | Prohibited |
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