Implementing ISO12646 standards for soft
proofing in a standardized printing workflow
Aditya Sole
Gjøvik University College, The Norwegian Color Research Laboratory, Norway
1 Implementing ISO12646 standards for soft proofing in a standardized printing workflow Aditya Sole Gjøvik University College, The Norwegian Color Research Laboratory ABSTRACT: This paper defines one of the many ways to setup a soft proofing workstation comprising of a monitor display and viewing booth in a printing workflow as per the Function 4 requirements of PSO certification. Soft proofing requirements defined by ISO 12646 are implemented in this paper. Nec SpectraView LCD2180WG LED display along with Just colorCommunicator 2 viewing booth and X-rite EyeOne Pro spectrophotometer are used in this setup. Display monitor colour gamut is checked for its ability to simulate the ISO standard printer profile (ISOCoatedV2300%.icc) as per the ISO 12646 requirements. Methods and procedures to perform ambient light measurements and viewing booth measurements using EyeOne Pro spectrophotometer are explained. Adobe Photoshop CS4 software is used to simulate the printer profile on to the monitor display, while, Nec SpectraView Profiler software is used to calibrate and profile the display and also to perform ambient light and viewing booth measurements and adjustments. INTRODUCTION: Soft proofing can be defined as ‘the ability to match colour images displayed on colour monitors to the images produced when the same digital file is rendered by proofing and printing systems’ [1]. ISO 12646 define parameters for monitor and viewing booth condition setup for soft proofing environment. The practical methods to implement these standards as per the job requirements are not been defined. This paper therefore, describes one of the ways to setup an appropriate soft proofing station (comprising of a monitor and a viewing booth with the appropriate ambient lighting conditions) according to ISO 12646 standards for soft copy and hard copy proof comparison in the graphic arts industry and evaluate the same. STANDARDS FOR SOFT PROOFING (SPECIFICATIONS): This paper primarily focuses on the scenario where soft copy is directly compared with the hard copy. The technical requirements are defined by ISO 12646 for this scenario as ambient illumination, surroundings and environment, Chromaticity, luminance of the white and black points, Colorimetric accuracy & grey balance of the display, Uniformity of display luminance. Table 1 below summarizes the specification and tolerances defined by ISO 12646 standards for soft proofing. Parameters Target Colour Temp Intensity Chromaticity Uniformity Black point Ambient light 5000°K ¼ monitor white point Uniformly Diffuse -NA- Surround Neutral and matt with luminous reflectance between 10% and 60% Display 5000°K >80 cd/m2 U’= 0.2092 v’= 0.4881 10% within the centre measurement Luminance < 1% of max luminance Viewing booth 5000°K 500lux ± 125lux u’10 = 0.2102 v’10 = 0.4889 for 1m2 area, luminance = >75% luminance at the centre -NA- Table 1 Specification and tolerances according to ISO 12646 standards for soft proofing
proofing in a standardized printing workflow
Aditya Sole
Gjøvik University College, The Norwegian Color Research Laboratory, Norway
1 Implementing ISO12646 standards for soft proofing in a standardized printing workflow Aditya Sole Gjøvik University College, The Norwegian Color Research Laboratory ABSTRACT: This paper defines one of the many ways to setup a soft proofing workstation comprising of a monitor display and viewing booth in a printing workflow as per the Function 4 requirements of PSO certification. Soft proofing requirements defined by ISO 12646 are implemented in this paper. Nec SpectraView LCD2180WG LED display along with Just colorCommunicator 2 viewing booth and X-rite EyeOne Pro spectrophotometer are used in this setup. Display monitor colour gamut is checked for its ability to simulate the ISO standard printer profile (ISOCoatedV2300%.icc) as per the ISO 12646 requirements. Methods and procedures to perform ambient light measurements and viewing booth measurements using EyeOne Pro spectrophotometer are explained. Adobe Photoshop CS4 software is used to simulate the printer profile on to the monitor display, while, Nec SpectraView Profiler software is used to calibrate and profile the display and also to perform ambient light and viewing booth measurements and adjustments. INTRODUCTION: Soft proofing can be defined as ‘the ability to match colour images displayed on colour monitors to the images produced when the same digital file is rendered by proofing and printing systems’ [1]. ISO 12646 define parameters for monitor and viewing booth condition setup for soft proofing environment. The practical methods to implement these standards as per the job requirements are not been defined. This paper therefore, describes one of the ways to setup an appropriate soft proofing station (comprising of a monitor and a viewing booth with the appropriate ambient lighting conditions) according to ISO 12646 standards for soft copy and hard copy proof comparison in the graphic arts industry and evaluate the same. STANDARDS FOR SOFT PROOFING (SPECIFICATIONS): This paper primarily focuses on the scenario where soft copy is directly compared with the hard copy. The technical requirements are defined by ISO 12646 for this scenario as ambient illumination, surroundings and environment, Chromaticity, luminance of the white and black points, Colorimetric accuracy & grey balance of the display, Uniformity of display luminance. Table 1 below summarizes the specification and tolerances defined by ISO 12646 standards for soft proofing. Parameters Target Colour Temp Intensity Chromaticity Uniformity Black point Ambient light 5000°K ¼ monitor white point Uniformly Diffuse -NA- Surround Neutral and matt with luminous reflectance between 10% and 60% Display 5000°K >80 cd/m2 U’= 0.2092 v’= 0.4881 10% within the centre measurement Luminance < 1% of max luminance Viewing booth 5000°K 500lux ± 125lux u’10 = 0.2102 v’10 = 0.4889 for 1m2 area, luminance = >75% luminance at the centre -NA- Table 1 Specification and tolerances according to ISO 12646 standards for soft proofing
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