Why Calibration?

The aim of colour calibration is to measure and/or adjust the colour response of a device (input or output) to a known state. In International Color Consortium (ICC) terms, this is the basis for an additional colour characterization of the device and later profiling. Colour calibration is a requirement for all devices taking an active part of a colour-managed workflow.

Calibration Methods

  • Pure software calibration show loss of tonal values and limited quality
  • Combination of software and hardware calibration shows loss of fewest tonal values and semi-professional quality
  • Hardware calibration show no loss of tonal values and professional top quality

Step 1 of hardware calibration

Measure luminance and colour of white point and black point using an external sensor and adjustement of the LUT for white point, black point (or Red, Green and Blue point). Tuning of gamma curve (gray shade control).

Step 2 of hardware calibration

Creation of a ICC profile for the operating system (PC/MAC)

Why-Calibration-Image_x_en

ICC Profiles

ICC-Profiles-Image_x_en

ICC profile is a set of data that characterizes a colour input or output device, or a colour space, according to standards promulgated by the International Color Consortium (ICC). Profiles describe the color attributes of a particular device or viewing requirement by defining a mapping between the device source or target colour space and a profile connection space (PCS).

More info

www.colormanagement.org

www.eci.org

Colour Workflow

The 3D LUT Colour Emulation feature of the SpectraView Series can take the ICC profile of any device, e.g. printer, and through uploading via the MultiProfiler software application, define the monitor gamut to that specific ICC profile.


Colour Spaces

sRGB (Standard RGB)

  • Defined by Microsoft and Hewlett Packard in 1996
  • Average CRT monitor space
  • Suitable for internet and office applications
  • Too small for artwork, not 100 % suited for print workflow
  • Contained in Photoshop
  • White point D65
  • Tonal response curve: modified gamma 2.2

Adobe RGB

  • Defined by Adobe in 1998
  • Standard working space in the U.S
  • Contains 98% of all printable colours
  • Contained in Photoshop
  • White point D65
  • Tonal response curve: gamma 2.2

eciRGB_v2

  • Defined by Color Solutions in 2005
  • Standard working space in Europe (see www.eci.org )
  • ISO standard 22028-2:2007
  • Contains 100 % of all printable colors
  • NOT contained in Photoshop
  • White point D50
  • Tonal response curve: L*

dsRGB

Colour-Spaces-Logo

C olour space for colour accurate large format display applications. Perfectly matched to NEC public displays

  • Slightly larger than current sRGB standard
  • Red, green, blue primaries (xy coords)
  • Tonal response curve (the Gamma curve)
  • White point 7500 K

Download the ICC File

L*a*b* (CIELAB)

The L*a*b* system defines the colour space with a dimension ‘L’ for lightness and ‘a’ and ‘b’ for the colour dimensions based on non-linearly compressed CIE XYZ space coordinates. Changes in colours are similar to human visual perception abilities. It allows precise table profiling and is perfectly suited to exceptionally accurate 14-bit LUT hardware calibration capability of the SpectraView series.

Other RGB spaces

  • CIE-RGB: mercury spectrum
  • PAL, SECAM, NTSC: TV Standards, phosphor
  • ProPhoto RGB: digital photography
  • Wide Gamut RGB
  • DonRGB
  • sRGB / dsRGB
  • Adobe RGB
  • eciRGB_v2
  • L*a*b*

3D Look-Up Tables

Look-Up-Tables-Image_x_en

The integrated 3D LUT with colour emulation preset within the SpectraView and SpectraView Reference products, can be used to transform the colour space of the monitor to emulate that of the printer, or other colour workflow device. The 3D LUT is a three dimensional table that maps colours into a different colour space. The Colour Processing Engine in SpectraView monitors allows complex colour gamuts such as those of colour printers to be emulated on the monitor directly. This allows print previews to be performed with applications that do not support this feature directly. The MultiProfiler application can easily load ICC Profiles into the 3D Look Up Tables.


Wide Colour Gamut

Experience the very best in colour image quality with the latest generation of state-of-the-art 10-bit P-IPS technology, with exceptionally wide viewing angle, widest colour gamut available (107% AdobeRGB colour space coverage and 98 % size) and absence of colour shift. The true benefit of a wide colour gamut display is particularly visible when combined with 10-bit panel, since potential colour banding or visible grayscale steps are eliminated.

withoutwith


SpectraView Profiler Software

Profiler-Software-Image_x_en

The bundled calibration and profiling software package, SpectraView Profiler, allows precise and straightforward 14-bit per RGB channel, calibration of brightness, white point and luminance and the creation of 16-bit ICC profiles for Apple and Windows systems.

With 16384 tonal values per colour, the Profiler enables an almost step-less and, in turn, considerably more precise gradation adjustment than is the case with conventional software calibration. The finest gradations and grayscales can be displayed with extraordinary precision and clarity. This ensures that the colours seen on the screen match the printer.

  • Hardware calibration via DDC/CI and USB (with SpectraView Profiler Ver 5.0)
  • L*-calibration (CIE-LAB L* colour space), alternative calibration with gamma 1.8 or 2.2 or user-specified gamma values, sRGB or CIECAM02 calibration
  • Creation of LUT-based 16-bit ICC and table profiles
  • Iterative calibration process
  • Manual white point and calibration curve editing
  • White and black luminance adjustment (or contrast range)
  • Profile validation for fast checking of calibration profiles
  • Evaluation of workplace ambient light and viewing conditions in accordance with ISO 3664 and 12646
  • Automatic hardware adjustment of JUST Normlicht lightbox by software
  • Chromatic adaptation

You can download the current version of the SpectraView Profiler software as well as do registration and licencing here .


Colour Conformance

SpectraView award-winning models featuring IPS panels have recently added FOGRA PreCert Class Aapproval to their many accolades which is the print industry benchmark for colour accuracy. As well as satisfying the print industry benchmark FOGRA PreCert requirements, SpectraView displays can also be used as part of ISO approved pre-press and soft proof systems. Two ISO standards have emerged to serve the soft proof industry in comparing colour proofs: ISO 3664:1996 and ISO 12646:2008

Colour-Conformance-Image_x_en