Printing Conditions. Design & Prepress. Printing. Predictability Printing the Expected. Printing Workflow. Design/Prepress Workflow

Transcription

1 Predictability Printing the Expected 1 3 Content-Check (Preflight) Validation Contract Proof Softproof Data formats (28178, Cxf) Expectation check (Job Sheet) Side-by-Side / MediaRelative Tolerances Printing Workflow Design & Prepress Printing Conditions CMYK 2 Spot Printing 3 4 Concept based on N1391 Design/Prepress Workflow 5 Tools 4 Identification of Printing Condition Data preflight Contract Proof Softproof Control Targets Process Control Colour Conformance Print image quality & permanence

2 General Print buyer and manufacturer 1 Print product buyer Responsible to define and create the product under economical constraints Communicate the customers expectation to the designer Approve the intermediate prints and proofs prior to final production Knows the attributes of the product and the desired quality Print product manufacturer Responsible to print and assemble the product under economical constraints Print the content of a digital file on a digital printing process Image and print the content of a digital file on a conventional printing process Knows the attributes of the printing process and the achievable quality Different views on the final print product Interests of print buyers are different than interests of print manufacturers Desired quality and achievable quality may differ and are conflicting areas

3 Printing Conditions CMYK 2 Spot CMYKbased - Printing conditions Separating CMYK work from Spot (Packaging) Addressing the nature of printing conditions from printers point of view (list of parameters and aims) Offset ("TVI-Solids are enough") versus non Offset (char.-data) from prepress point of view (char. data sets and ICC profiles) from conformance point of view Concept of paper types and governing factors (OBA, colour, gloss, screening) Addressing characterization data and reference characterization data (CRPC in ISO & ISO /3) Addressing data formats (12642, 28178, /2/3/4) and the generation of char.-data Reference printing condition Printing condition PDF/X Document format PDF/X Document format Design Prepress Press Digital contract proof Digital contract proof

4 Printing conditions Set of primary process parameters which describe the conditions associated with a specific printed output, associated with colorimetric and/or densitometric aim values Such parameters usually include (as a minimum) printing process, print substrate, printing ink, screening and printing sequence. The aim values typically comprise the colorant description and tone value increase aims A printing condition is defined here as a print substrate description, a colorant description, a screening description, an ink set and a printing sequence Characterized printing condition For the purposes of colour management, a printing condition is fully characterized by giving the relationship between the CMYK digital input values and the corresponding measured colorimetric values Based on a given set of characterization data, and a definition of achromatic perception, a grey condition might be extracted Reference printing condition Set of primary process parameters which describe the conditions associated with a printing process which is not associated with a specific printing process Such parameters usually include the colour of the printing substrate, the primary and secondary colorants A process conversion based on colorimetric principles between a reference printing condition and a final print condition might be necessary Characterized reference printing condition For the purposes of colour management, a reference printing condition is fully characterized by giving the relationship between the CMYK digital input values and the corresponding colorimetric output values

5 Design & Prepress Design & Prepress Workflow 3 Concentrate on CMYK+Spot (separate from package) Concentrate on PDF and separate from other channels (emedia) Content Creation (e.g. PDFXready) Early and late binding (PDF/X) Gamut and printability check Colour conversion (Colour server) toward reference printing conditions Conformance (Aims and tolerances) Content check by soft proof based on reference printing condition Content check by validation print based on reference printing condition

6 Printing 4 Printing based workflow Separating CMYK+Spot work from Multicolor Printing (Packaging) Identification of Printing Condition (Mismatch between Reference and Actual) Data preflight (e.g PDFXready) & Process Adjustments Contract Proof (ISO ) Softproof (ISO 14861) Control Targets Process Control and calibration techniques (ISO , ISO/TS 10128) Colour Conformance for OK-sheet, print run (ISO 15311, 15339, 16761) Print image quality (ISO 15311)

7 Process calibration Systematic modification of the content data received to enable the results printed on a specific device to match the appearance of the same content data as it would have been printed on a reference device Process adjustment Methods for the modification of the digital content data that is input to a printing system to achieve consistency in the printed results among a number of presses printing to the same general aim conditions matching of 1-dimensional tone value scales (tone value increase) matching of 3-dimensional near-neutral scales (grey balance) matching of multi-dimensional colour transformations

8 Tools 5 Infrastructure for Prepress & Print Workflows Viewing Conditions (ISO 3664:2009) Measurement conditions (mode: M0, M1, M2, M3 and backing) Grey reproduction and grey balance Adjustment of data for substrate colour differences tbd