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A Colorimetric Analysis Methodology for Philatelic Studies Prepared for Stampshow 2010 David L. Herendeen 12 August 2010.

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Presentation on theme: "A Colorimetric Analysis Methodology for Philatelic Studies Prepared for Stampshow 2010 David L. Herendeen 12 August 2010."— Presentation transcript:

1 A Colorimetric Analysis Methodology for Philatelic Studies Prepared for Stampshow 2010 David L. Herendeen 12 August 2010

2 2 200,010,010200,020,10200,010,010

3 3 230,250,090230,235,90220,240,085

4 4 200,010, ,020,010

5 5 What Color Are These 1851 Stamps ? Bright Orange Brown Rose Brown Intense Orange Brown Dull Red Dull Claret Pale Orange Brown Morocco Dull Red Rose Brown Reddish Orange Brown Deep Orange Brown Dull Claret Courtesy National Postal Museum

6 6 What Color Are These 1851 Stamps ? Bright Orange Brown Rose Brown Intense Orange Brown Dull Red Dull Claret Pale Orange Brown Morocco Dull Red Rose Brown Reddish Orange Brown Deep Orange Brown Dull Claret Courtesy National Postal Museum

7 Color is not so Easy IS IT ??

8 8 Talking Points Some background Some background What we planned What we planned What we did What we did What we learned What we learned Whats next? Whats next? NPM Support...A Retrospective NPM Support...A Retrospective

9 9 Background What is color? What is color? What is colorimetry What is colorimetry Spectroscopy and the VSC 6000 Spectroscopy and the VSC 6000 How are colors measured? How are colors measured? Commission International de lEclairage (CIE) Commission International de lEclairage (CIE)

10 10 Background Measure Reflectance or Absorption of Light CIE Color Models

11 11 What we planned Use the NPM VSC 6000 to perform colorimetric analysis Use the NPM VSC 6000 to perform colorimetric analysis Understand colorimetry in the philatelic context Understand colorimetry in the philatelic context Understand the scientific measurement of color and its relationship to stamps Understand the scientific measurement of color and its relationship to stamps Determine if scanning can be used as a cost- effective substitute for spectroscopy Determine if scanning can be used as a cost- effective substitute for spectroscopy

12 12 What we did Analyzed hundreds of Slovenian postage due stamps of Analyzed hundreds of Slovenian postage due stamps of Recorded results and reduced data Recorded results and reduced data Correlated spectroscopic results with human color expert Correlated spectroscopic results with human color expert Developed interpolation model for use with scanners Developed interpolation model for use with scanners

13 13 Sampling the stamps …What we did

14 14 Sampling the stamps …What we did

15 15 Sampling the stamps …What we did

16 16 Processing the results …What we did

17 17 Processing the results …What we did

18 18 Comparison by expert …What we did

19 19 Color categories …What we did

20 20 Color categories …What we did

21 21 Color categories …What we did Brick Red

22 22 Color categories …What we did Deep brownish carmine Brick Red

23 23 Color categories …What we did Deep brownish carmine Red Brick Red

24 24 Color categories …What we did Deep brownish carmine Red Carmine Brick Red

25 25 Categories are Fuzzy …What we did

26 26 Categories are Fuzzy …What we did Fuzzy Weighting Function

27 27 Theoretical development …What we did Formulated a method for defining color categories Formulated a method for defining color categories Created a model for understanding how individual perception can affect philatelic color identification Created a model for understanding how individual perception can affect philatelic color identification Correlated this model to real test data Correlated this model to real test data Formed a building block for future philatelic color research Formed a building block for future philatelic color research

28 28 Using a scanner …What we did Spectroscope for Tristimulus Values (X,Y,Z) Calibrate Your Scanner (R,G,B) Unknown Sample (R u,G u,B u ) 3D Interpolation Function Maps to: (X u,Y u,Z u ) u,v

29 29 What we learned How to apply the VSC 6000 for colorimetry How to apply the VSC 6000 for colorimetry Philatelic color is NOT a matching problem, it is about categorization Philatelic color is NOT a matching problem, it is about categorization Colorimetry is faster and cheaper than x-ray spectroscopy methods Colorimetry is faster and cheaper than x-ray spectroscopy methods Scanners can be used to identify colors IF preliminary analysis has been performed Scanners can be used to identify colors IF preliminary analysis has been performed

30 30 Whats next? Completing the scanner mapping Completing the scanner mapping Documenting and publishing all results Documenting and publishing all results Extending the methodology to new projects Extending the methodology to new projects

31 31 Two papers: Two papers: –Philatelic Shade Discrimination Based on Measured Color (Herendeen, Allen and Lera) Color Research and Applications and/or London Philatelist Color Research and Applications and/or London Philatelist –Using a Scanner to Determine Stamp Shades (Herendeen, Allen and Lera) London Philatelist or Collectors Club Philatelist London Philatelist or Collectors Club Philatelist Documenting the work …Whats next?

32 32 NPM Support Value of NPM scholarship program Value of NPM scholarship program Leveraging human resources Leveraging human resources Incubator for IAP Incubator for IAP

33 33 Acknowledgements Mr. Allen Kane Mr. Allen Kane –For his vision of extending the services of the NPM to the philatelic world Mr. Thomas Lera, Winton Blount Chair of Research, NPM Mr. Thomas Lera, Winton Blount Chair of Research, NPM –For his continual support and assistance with all aspects of this effort Mr. James Allen, Senior Fellow, IAP Mr. James Allen, Senior Fellow, IAP –For his long hours sorting and categorizing Slovenian postage dues

34 The End


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