REFERENCES 



57 



The important point for purposes of this 

 discussion is that changes in dominant wavelength 

 and changes in colorimetric purity are not equally 

 effective in arousing changes in color sensations. 

 In some places on this chart the eye is more 

 sensitive to dominant wavelength than to color- 

 imetric purity (e.g., around 580 and 525 van). 

 In other locations, it seems to be more sensitive to 

 differences in colorimetric purity (e.g., around 

 485 m/j) . This is one approach to the problem of 

 measuring color sensations. Still others are 

 possible. 



Research Needed. This very brief discussion 

 may be sufficient to show that the magnitudes 

 of our sensations can be related systematically to 

 the magnitudes used to measure light and color. 

 In some ways, the former are the more important 

 magnitudes because they are the ones which 

 largely determine our reactions. Psychologists 

 have just barely begun to explore this field and 

 fruitful problems are here for the asking. Many 

 important applications will undoubtedly await 

 the accumulation of basic data in this area. As an 

 illustration, it might be possible to use colors in a 

 quantitative scale to represent the third dimension 

 on visual displays. Before any such application 

 as this can be made, however, it will be necessary 

 to extend still further the basic work started by 

 MacAdam. 



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