The SCTV, the Spot Colour Tone Value, is a ratio of the colorimetric difference between the hue, the substrate and the solid tone.
SCTV uses L*a*b* as a basis, and in the best case also spectral data, and therefore works equally well with all spot colours, printing processes and papers and delivers a consistent result. When calibrating spot colours, SCTV reliably produces a result in which the 50 % hue of the colour is visually very close to the expected 50 % appearance.
In the past, defined target values for the tonal value were specified by tone value increase (TVI) depending on the printing process and substrate. ISO 12647-2:2015, for example, specifies 16% dot gain for CMYK on image printing and 22% dot gain for uncoated paper.
With SCTV, however, the target value for SCTV is the same as the colour tone value. A 50% tone value should have a measured value of 50%, all other tone values should also have their respective pedant. This means that SCTV is visually consistent, which is not the case with density-based approaches, and is therefore more suitable for spot colours.
Several errors have crept into the new PANTONE 2023 fan decks. In both the PANTONE Solid Coated and the Solid Uncoated color fans, there are colours for which the new ink formulations are incorrect. In the PANTONE Formula Guide Solid Coated fan 2023, PANTONE 107 C and PANTONE 108 C have absolutely identical ink recipes, as well as PANTONE 113 C and PANTONE 114 C. As the colors differ, this cannot be the correct. Several errors in the PANTONE Solid Uncoated fan 2023 In the PANTONE Solid Uncoated fan 2023 … read more
Over the last few months, we at Proof.de have been thinking about further improving our already very good colour measurement technology in terms of speed and measurement precision. Relatively quickly it became clear that only two devices would come into question: The KonicaMinolta MYIRO-9, the successor of the former FD-9, or the X-Rite ISIS 2 XL. The starting point: Since we at Proof GmbH have 5 proofing devices, the calibration of targets for profile optimisation is a time-critical undertaking for us. Therefore, we had been looking around for an upgrade of … read more
In recent weeks, there have been lengthy discussions on the Fogra digital printing mailing list as to whether a research project should be launched to define standardised tonal value gradations for spot colours. What is this all about? In the field of CMYK and seven-colour printing, the definition of clear, printable and proofable standards is well established and has been tried and tested in practice. If the paper or paper class is known and defined, a measuring standard such as M0/M1/M2 has been established and the content of optical brighteners … read more
This year we once again created proofs for Fogra certification and sent them to Munich-Aschheim for testing. With these proof prints, which we print according to three different proof standards and on three different papers, we point out that we not only deliver excellent proof quality through internal quality controls and checks, but that the quality of our proofs is also measured and confirmed by external experts. We have now had test prints certified by Fogra for the 12th time. We have also been “Spot-cert” certified for the display of … read more
In the current issue of Fogra News “Fogra Aktuell” Proof GmbH is involved in two places. Firstly, a summary of the Fogra report on our first FOGRA55 certification for seven-colour printing with extended colour space in CMYKOGV appeared. You can also find more information on our FOGRA55 certification on the Fogra website: https://fogra.org/en/press-releases/fogracert-erste-cpc-zertifizierung-fuer-fogra55-cmykogv-330 and on proofing.de: And secondly, there was a report on the completion of the research project for textile digital printing, FOGRA58, in which we were allowed to investigate and test the proof capability of the new textile … read more
A new generation of colour measuring devices is entering the market: in contrast to the classic measuring devices, which are available as a fully encapsulated system either as a colourimeter or as a spectrophotometer, and then supply the data to a computer via an interface or app or display it directly, the new generation of colour measuring devices consist only of lighting and software, with the optics of a modern iPhone from Apple being used as the sensor. Until now, there have been two categories of measuring devices on the … read more
Offset and Newsprint ISO Coated v2 (ECI) / ISO Coated v2 300% (ECI) Profile: ISOcoated_v2_eci.icc Standard for glossy and matte coated paper Paper: Types 1 and 2, gloss and matte coated Tone value increase curves A (CMY) and B (K) as defined in ISO 12647-2:2004 Characterisation Data: FOGRA39L ISOUncoated Profile: ISOUncoated.icc Standard for uncoated white natural paper Paper: paper grade 4, uncoated white offset, dot gain curves C (CMY) and D (K) from ISO 12647-2: 2004 Characterisation Data: FOGRA29L PSOCoatedV3 / Fogra 51 Profile: PSOcoated_v3.icc The successor of ISOCoatedV2 for glossy … read more
In recent years, various problems have arisen with our previous proof paper supplier. On the one hand, we sometimes had to wait more than three months for paper deliveries; on the other hand, we sometimes had significant problems with batch-to-batch discrepancies, surface defects and much more. After lengthy deliberations, we decided in December to replace all the paper. We therefore received pallets of new paper at the turn of the year, which we are now gradually incorporating into our production. There will be no hard cut, but the new papers … read more
In this short image video we – the Proof GmbH – introduce us and our work. Find out who we are and what drives us. What do you think of our short film?
In 2021 proof.de was again Fogra certified including Fogra “Spot cert” certification, i.e. for the display of spot colours such as PANTONE C and U.