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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > November  >
Information • Textbooks • Media • Resources
Computer Bulletin Board
Beyond λmax: Transforming Visible Spectra into 24-Bit Color Values
Darren L. Williams, Thomas J. Flaherty, Casie L. Jupe, Stephanie A. Coleman, Kara A. Marquez, and Jamie J. Stanton
Department of Chemistry, Sam Houston State University, Huntsville, TX 77340
Cover
November 2007
Vol. 84 No. 11
p. 1873
Abstract
This article introduces the standardized definition of color, and provides a spreadsheet tool in the Supplemental Material that allows the assignment of standard 24-bit color values to solutions based upon their visible spectra. A digital photograph of several colored solutions was taken. The visible spectra of these solutions in the range of 400–700 nm were obtained with a spectral bandpass of 5 nm. The spectra were exported to a spreadsheet where they were transformed into tristimulus values, chromaticity coordinates, and standard 24-bit RGB colors. Using the spreadsheet drawing tools, a color swatch for each solution was created to display the corresponding RGB color. Finally, the digital image of the solutions was imported and compared to the color swatches to explore the differences and similarities of photographic and spectrophotometric colorimetry. The spreadsheet data analysis is emphasized in this article, since the lab procedures for obtaining visible spectra are well-established in most undergraduate curricula.
Supplement
The spreadsheet used for this analysis—in both Excel and Quattro Pro formats—is available.
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Contents
  JCE2007p1873W.pdf
 
JCE2007p1873W.zip
Folder JCE2007p1873W containing JCE2007p1873W.xls (Microsoft Excel) and JCE2007p1873W.qpw (Quattro Pro)
More Information
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Citation
Williams, Darren L.; Flaherty, Thomas J.; Jupe, Casie L.; Coleman, Stephanie A.; Marquez, Kara A.; Stanton, Jamie J. J. Chem. Educ. 2007, 84, 1873.
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Keywords
Analytical Chemistry; Dyes / Pigments; Hands-On Learning / Manipulatives; Organic Chemistry; Physical Chemistry; Upper-Division Undergraduate; UV-Vis Spectroscopy
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History
Created:
Last Updated:
9/19/2007
9/27/2007
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