ISO 15930-4:2003 pdf download

ISO 15930-4:2003 pdf download.Graphic technology -Prepress digital data exchange using PDF一 Part 4: Complete exchange of CMYK and spot colour printing data using PDF1.4(PDFIX-1a).
3.24
printing tone-value
number, recorded as data in the computer, corresponding to that percentage area on a printing forme that is intended to accept ink for transfer to the final sheet in offset lithography, or the equivalent in other printing systems
NOTE See characterized printing condition (3.3).
3.25
process colorant
one of a set of colorants that, when printed together, produce a range of colours able to reproduce the values specified by a colour coordinate system and which, in the context of this part of this International Standard, always refers to C, M, Y, or K
NOTE See CMYK (3.4).
3.26
reader
software application that is able to read and appropriately process files
3.27
spot colour
single colorant, identified by name, whose printing tone-values are specified independently from the colour values specified in a colour coordinate system
3.28
trapping
modification of boundaries of colour areas to account for dimensional variations in the printing process by overprinting in selected colours at the boundaries between colours that might inadvertently be left uncoloured due to normal variations of printing press registration
NOTE Trapping is sometimes referred to as chokes and spreads or grips. This is not the same as ink trapping.
3.29
writer
software application that is able to write files
4 Notations
PDF operators, PDF keywords, the names of keys in PDF dictionaries, and other predefined names are written in a bold sans serif type font; for example, the key Trapped.
Operands of PDF operators or values of dictionary keys are written in an italic sans serif font; for example the False value for the Trapped key.
For the purposes of this part of this International Standard, references to the “PDF Reference” are to the PDF Reference: Adobe Portable Document Format corrected by the errata dated 2003/6/18 (see Clause 2).
5 Conforming files and equipment
This part of this International Standard defines the use of the PDF file format for the exchange of digital data representing a compound entity.
A conforming PDF/X-la file is a PDF file in which those features necessary for the exchange of a compound entity are in accordance with this part of this International Standard. A conforming file may also include other valid PDF features that do not affect final print reproduction of the compound entity.
Neither the version number in the header of a PDF file, nor the value of the Version key in the Catalog of a
PDF file shall be used in determining whether a file is in accordance with this part of this International
Standard.
A conforming PDF/X-la writer is a software application that shall be able to write files in accordance with the requirements of this part of this International Standard. A conforming PDF/X-la reader is a software application that shall be able to read and appropriately process all conforming PDF/X-la files as defined in this part of this International Standard. A conforming PDF/X-la reader shall also be able to read and process all files in accordance with the PDF/X-la conformance level specified in ISO 15930-1:2001 having a value of (PDFIX-1:2001) for the GTS_PDFXVersion key, and (PDF/X-la:2001) for the GTS_PDFXConformance key in the Info dictionary and that also conform to 6.16 of this part of this International Standard. The processing of files conforming to the PDF/X-1 conformance level as specified in ISO 15930-1:2001 by a PDF/X-1 a reader shall be at the discretion of the application software.
NOTE The ability to read files prepared in accordance with the PDF/X-la:2001 conformance level as specified in ISO 15930-1:2001, the predecessor to this part of ISO 15930, is important to preserve compatibility. Users are cautioned that there are several different conformance levels that may be associated with PDFIX readers and writers. Two of these are generally referred to as PDF/X-la. These are defined in Parts I and 4 of this International Standard. These are referred to as PDF/X-la:2001 and PDF/X-la:2003, respectively.
Although PDF Reference permits compliance with earlier versions of PDF, features described in versions of the PDF specification earlier than 1.4, but not described in PDF Reference, should not be used in a conforming PDF/X-la file. Such features may be ignored by a PDF/X-la reader.
All conforming readers shall parse all PDF files but may ignore those features not required by this part of ISO 15930. A reader may ignore an annotation’s Print flag except for those in a TrapNet annotation.
Rendering of conforming files shall be performed as defined in the PDF Reference and as restricted by this part of ISO 15930. To the extent that the PDF Reference and this part of this International Standard permit more than one rendering of a conforming file, a conforming reader may use embedded job-ticket or metadata information to control the rendering of the file more precisely.