#COLOR19 Ideal Viewing Conditions: QC Across the Color Supply Chain

Transcription

1 #COLOR19 Ideal Viewing Conditions: QC Across the Color Supply Chain Robert McCurdy President GTI Graphic Technology, Inc. 1

2 About GTI Leading manufacturer of tight tolerance lighting systems 100% dedicated to the lighting business Desktop viewers to large format viewing areas Headquarters in Newburgh, NY All products manufactured in the United States Sales and distribution office Germany Worldwide network of dealer partners Graphiclite D50 products Designed for the graphic arts market Conform to the ISO 3664:2009 viewing standard CMlite D65 products Designed for the industrial color market Conform to the ASTM D , SAE J361, and BS-950 Part 2 standards 2

3 Every partner in the supply chain needs to be concerned about viewing conditions. Brand Owner Designer Photographer Print Buyer Printer Pre-Press 3

4 What are Ideal Viewing Conditions? Conditions that conform to ISO 3664:2009 The international standard for graphic technology and photography Conditions that are consistent From viewer to viewer and location to location Good viewing environment Minimum ambient light, neutral colors, etc. 4

5 Why Do We Need a Viewing Standard? To enable effective communication of color between all participants in the supply chain Optimize critical comparison of target image and reproduction 5

6 What is ISO 3664:2009? ISO 3664:2009 is a set of specifications Defines targets and tolerances for D50 viewing conditions Reflective media prints and photographic Transmissive media transparencies Images displayed in isolation on a color monitor Enables lighting engineers and manufacturers to design, test, and certify their viewing systems. When properly implemented it will reduce errors and improve color communication 6

7 Five Elements of ISO 3664:2009 Color Quality Light Intensity Evenness Surround Geometry 7

8 Color Quality On the viewing surface Chromaticity coordinates of a light source should be within a radius of the D50 chromaticity coordinates (u 10 = , v 10 =0.4889). Color Temperature should be 5000K Not all 5000K lamps are the same 8

9 Color Quality Spectral Power Distribution Most important in determining the rendition of colors Close as possible to CIE illuminant D50 Color Rendering Index (CRI): 90 or greater Metamerism Index: MI VIS <1, MI UV <1.5 Defines energy in visible and UV region of the spectrum ( NM) 9

10 Color Quality Spectral Power Distribution - examples UV Visible Daylight Cool White Fluorescent Incandescent 10

11 Light Intensity Consistent light intensity is critical to consistent image rendition Proofs and prints should be 2000 lux Preferred tolerance +/- 250 lux Required tolerance +/- 500 lux Allows full tonal visibility of shadow detail without washing out highlights Transparencies should be 1270 cd/m 2 Preferred tolerance +/- 160 cd/m 2 Required tolerance +/- 320 cd/m 2 Acceptable Range Preferred Range Acceptable Range 11

12 Evenness Even light intensity across the image assures correct interpretation of print reproduction quality Prints and proofs should be at least 1200 lux (60% of 2000 lux) at all points on the viewing surface 1200 Lux> 1200 Lux> 2000 Lux 1200 Lux> 1200 Lux> Transparencies within 75% of nominal (953 cd/m 2 ) 12

13 Surround Surround color and reflectance affect color appearance Prints and proofs: a neutral and matte surround with a luminous reflection of 10% and 60% should be used 60% reflectance is comparable to Munsell N8/ gray Transparencies: 5% to 10% luminance level 50mm on sides 13

14 Geometry Light source, image, and observer s eyes need to be positioned to minimize glare Standard doesn t specify lighting geometry but states glare should be minimized 14

15 How to Meet ISO 3664:2009 Conditions Use a light booth from a recognized manufacturer Construct Viewing System using correct components A system consists of electronics, structure, reflectors, lenses, and lamps 15

16 Maintaining Conformance To maintain conformance a maintenance program consisting of relamping, cleaning, and measurement is required. 16

17 Maintaining Conformance Before Relamp After Relamp 17

18 Maintaining Conformance Lighting Measurement Instrument Requirements This requires that the instrument used be capable of collecting data from 300 nm to 780 nm and reporting these data corresponding to measurements made at a data interval of 5 nm with a triangular bandpass and with a half-power width of 5 nm ISO 3664:2009 Annex D Spectral power distribution conformance testing 18

19 What to Consider When Purchasing a Viewing Station Size of samples Do you need to view a proof and press sheet simultaneously Number of reviewers The surrounding environment Ambient light Background colors The light source(s) Budget 19

20 The Light Source All 5000K lamps are not the same. To meet the ISO standard a lamp must have a spectral power distribution of D50 daylight. GTI lamps have a unique blend of fluorescent phosphors that produce an excellent CIE D50 When used in GTI viewing systems, GTI color viewing lamp produces an actual system CRI approaching

21 The Light Source Fluorescent D50 Simulation 21

22 What About LED? There is a big difference between general lighting applications and highly demanding applications like color viewing. The CIE has not presented standards for LED lighting. The lack of standardization is an issue and can result in inconsistencies between manufacturers and a variance in daylight lamp quality. 22

23 What About LED? LED characteristics change with time, temperature, current, and from batch-to-batch and manufacturer-to-manufacturer. LED technology is expensive in comparison to fluorescent. The cost to relamp a 29 x 52 fluorescent booth is currently $ You can relamp this booth once a year for nine years before you recover the cost of a higher priced LED booth. 23

24 What About LED? There is minimal energy savings from a daylight LED viewing booth. An LED and fluorescent luminaire designed to illuminate a 30 x 52 wide viewing area use nearly the same power. LED Daylight 160 Watts 24

25 What About LED? GTI is excited about the potential of LED technology and look forward to further implementing it into our product portfolio as it matures. Until standards are in place we recommend D50 fluorescent light be used for color evaluation and quality control. LED, along with other sources, be used as a secondary source to further check metamerism. 25

26 The lighting industry does not want to make the same mistakes with LED as they did with CFLs by moving too quickly into unknown, unproven areas. - Dr Martine Knoop, lighting application specialist at Philips Lighting Eindhoven 26

27 How Will ISO 3664:2009 Viewing Benefit You? Consistency Color will be viewed in the same lighting condition across the supply chain. The variable of lighting conditions is removed from the production process. Communication Reduces miscommunications due to non-standard light sources. Results in fewer proofing cycles, less redos, and faster customer approvals. Customer experience Viewing in consistent conditions provides a better experience for your customers and their customers. A light booth offers a more professional presentation atmosphere during reviews. 27

28 Conclusion Color plays a significant role in the consumers buying decision All parties in the supply chain should be using D50 lighting. ISO 3664:2009 ensures color is viewed under standard conditions. All GTI light booths ship with a Certificate of Conformance 28

29 Conclusion Standard viewing results in better color communication, reduced errors, fewer remakes, faster turn around, and greater profits. A controlled standard lighting system will help brand owners, production departments, and retailers to improve color management and communication for products of all types. 29

30 Without standard lighting three people look at the same color and see it differently. With standard lighting three people look at the same color and see the same color. 30

31 Thank You! 31