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Sunday, January 22, 2012

PROCEDURE FOLLOWED FOR IMPLEMENTING THE CONDITIONS/ SPECIFICATIONS MENTIONED ABOVE: In this section methods and procedures are proposed for implementing the specifications mentioned previously. To setup the soft proofing station and the ambient light condition following apparatus was used: • Hardware: NEC SpectraView LCD 2180WG LED display, Apple MAC PRO 10.4, Just Normlicht Colour Communicator 2 viewing booth, X-Rite EyeOne Pro spectrophotometer including ambient light measurement adaptor, OSRAM L58W/950, LUMLUX de LUXE, Daylight tubes for ambient light • Software: SpectraView Profiler Version 4.1 (NEC SpectraView monitor calibration and profiling software), UDACT (UGRA Display Analysis Certification Tool) monitor certifying software by UGRA, Adobe Photoshop CS4 Nec SpectraView LCD 2180EG LED display was used as the display monitor to display the soft copy images. Nec LCD 2180WG LED is a high end display which features individual high power red, green and blue LEDs (Light Emitting diodes) as a backlight light source for the LCD, instead of the typical CCFL (Cold Cathode Fluorescent Lamp) [2]. LED backlight results in a wide output colour gamut of the display. Hardware calibration can be performed on this display using its own calibration and profiling software. Hardware calibration eliminates the need to correct the RGB output for smooth, accurate display of greyscale images. Nec SpectraView Profiler software calibrates and profiles the Nec LCD 2180WG LED display monitor. The software allows custom target calibrations that can be preset or can be defined by the user. The user can define the white point, light intensity, gamma curves, black point, etc. At the end it also profiles the display and generates a *.icc colour profile. Target and measured results are analysed and displayed, showing information like measured colour, colour difference, gamut etc [2]. Just colorCommunicator 2 viewing booth was used for the soft proofing station along with the NEC SpectraView monitor display. The light intensity of the viewing booth can be adjusted via software to match the light intensity of the display for soft proofing [6]. To perform the measurements of light intensity, white point, colour rendering on the monitor display and on the hard proofing a number of different measuring instruments can be used. To avoid inter-instrument uncertainty and reproducibility issue only one instrument has been used for the measurements [3]. For this setup, a X-Rite EyeOne Pro spectrophotometer was used to perform the measurements on monitor display and hard copy and also to perform the ambient light measurements using the ambient light adaptor. MONITOR CALIBRATION AND VIEWING BOOTH ADJUSTMENT: To calibrate the monitor and adjust the viewing booth following procedure was followed: NEC SpectraView Profiler Version 4.1 software was used to calibrate, profile and adjust the viewing booth according to ISO 12646 standards for soft proofing. P2 viewing conditions defined in ISO 3664 were setup in the viewing booth according to ISO 12646 specifications (ISO 12646;Sec 4.8.2). The target for ISO 12646 standards define the parameters as follows: Display Type LCD Calibration method Hardware calibration (monitor LUTs) Calibration settings ISO3664 and ISO 12646 Profile settings LUT based (accurate) CIE Daylight standard D50 Tonal response Curve L* (recommended) Specify White and black luminance White 160 cd/m2 Black Minimum neutral Profile type 16 bit LUT based

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