Printers who are asked to print to international printing standards like ISO 12647-2 or GRACol will often be asked to produce work on paper stocks that deviate from the standard. pressSIGN 6 gives print buyers and printers the option of allowing pressSIGN to automatically amend the print target based on the substrate’s white point.
Changing the white point target in response to paper color gives a better visual representation of the original.
pressSIGN offers three methods of creating tonal curve adjustments, Tonal Value Increase (TVI), 4CX or Neutral Print Density.
By measuring the color bar containing a minimum of three tonal patches per color (e.g. 25%, 50% and 75%) pressSIGN creates tonal adjustment curves and exports these curves to a whole variety of RIP formats for platesetters and digital devices.
Alternatively output the tonal curves to Autocurves and apply the adjustments to a PDF workflow. AutoCurves is an additional application that is useful in a digital environment or where a platesetter RIP is unable to update an existing curve.
TVI, usually deferred to as dot gain, is the traditional way that printers have matched international standards such as ISO 12647-2. It is a simple method of achieving color matching to the standard.
4CX (4 color Exchange) technology targets grey balance for the tonal adjustments. 4CX takes into account black and white points of the target and print to produce the best visual match. For more details on 4CX technology visit the dedicated web page. pressSIGN 6 additional adds NPDC adjustments as a further means of attaining grey balance. NPDC reports maximum and average Delta L and F for CMY and maximum and average Delta L for black
When all conditions including ink and paper are ideal on a sheet fed offset press then 4CX, NPDC and TVI adjustments will produce the same results. However, we recommend 4CX on non-offset devices and where ink and paper do not precisely match the ISO standards.
pressSIGN supports all international print standards
Create customized print standards based on CMYK or Multi-color ICC profiles. pressSIGN also allows you to select a profile for the print condition and a separate profile for the grey balance. For example, the customer might require a job to be printed on uncoated paper but have supplied the file with a coated profile like ISOCoatedv2.icc. The ability to set a different target for the grey balance to the print condition allows you to generate correction curves that produce the best possible visual match.
Utilising an ICC profile as the print target allows pressSIGN to adjust the print target according to the color of the substrate. Printing to the amended target will produce a better visual match to the proof. Export the amended ICC profile to pre-press for proofing or soft proofing.
Create a print standard based on a single or set of previously measured printed sheets. It is useful to capture the existing print set up so that it can be replicated for re-runs.