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Fundamentos de Computação Gráfica Colors Gamut

Fundamentos de Computação Gráfica Colors Gamut. Jôner Duarte jmartins@inf.puc-rio.br. INF2608: T1 de Fundamentos da Computação Gráfica Colors Gamut. http://www.tecgraf.puc-rio.br/~mgattass/fcg/trb10/trb1/t110.html

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Fundamentos de Computação Gráfica Colors Gamut

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  1. Fundamentos de Computação GráficaColors Gamut Jôner Duarte jmartins@inf.puc-rio.br

  2. INF2608: T1 de Fundamentos da Computação GráficaColors Gamut http://www.tecgraf.puc-rio.br/~mgattass/fcg/trb10/trb1/t110.html Draw geometric models (solids using triangle mesh) in the color spaces CIE XYZ, CIE Lab and sRGB of the following color sets: • All visible colors combined from spectral pure sources. • sRGB color set • Munsell color set • Kodak Minilab color set

  3. Spectral Pure Colors ( XYZ ) • Spectral Pure Colors (λ=380~780)Blue (443)Green (504)Red (600) • CurvesBlack→Blue ( 379* -> 443 )Blue→Green ( 443 -> 504 )Green→Red ( 504 -> 600 )Red→ Black ( 600 -> 781* ) • Lines:Green→ BlackBlue→Red λ=379 and λ=781 return the coordinates XYZ(0,0,0)

  4. Spectral Pure Colors ( XYZ ) • 4 surfaces are described by the curves:

  5. Spectral Pure Colors ( XYZ )

  6. Spectral Pure Colors ( XYZ ) • Using D65 white reference to create 3 more surfaces:

  7. Spectral Pure Colors ( XYZ )

  8. sRGB ( sRGB ) • RGB CubeR = [0..255]G = [0..255]B = [0..255]

  9. sRGB ( XYZ )

  10. sRGB ( Lab )

  11. Munsell ( Lab ) • Segment Maxima method

  12. Munsell ( Lab ) • Segment Maxima method

  13. Munsell ( Lab )

  14. Munsell ( XYZ )

  15. Munsell ( sRGB )

  16. Kodak ( Lab ) • Segment Maxima method is used again

  17. Kodak ( XYZ )

  18. Kodak ( sRGB )

  19. GamutViewer

  20. GamutViewer – Class Diagram

  21. GamutViewer – Class Diagram

  22. Questions & Improvements • The solid created for Spectral Pure Colors should contain the other solids but the current solution doesn’t achieve that. • Are RGB coordinates supposed to have gamma corrections? Or only the colors represented by the coordinates?

  23. References • Jan Morovic, Calculating Medium and Image Gamut Boundaries for Gamut Mapping, Color Research and Applications, 2000 • Philipp Urban, Metamere und multispektrale Methoden zur Reproduktion farbiger Vorlagen, In Berechnung von Druckergamuts, Norderstedt, Books on Demand GmbH, 2005, pages 134-137 http://kb-bmts.rz.tu-ilmenau.de/gcg/html/Vortr_03_pdf/GamutRandBestimmung.pdf

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