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Color Research & Application, Volume 40, Issue 4, p. 374. http://onlinelibrary.wiley.com/doi/10.1002/col.21894/pdfArchived 8 October 2017 at the Wayback Machine "The usual definition of achromatic color is 'a perceived color without hue.' The colorimetric definition is that of an object with a flat reflectance function at a given level of reflectance, or one of its metamers."
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Color Research & Application, Volume 40, Issue 4, p. 374. http://onlinelibrary.wiley.com/doi/10.1002/col.21894/pdfArchived 8 October 2017 at the Wayback Machine "The usual definition of achromatic color is 'a perceived color without hue.' The colorimetric definition is that of an object with a flat reflectance function at a given level of reflectance, or one of its metamers."
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"Does hue affect the perception of grayness?", R Shamey, W Sawatwarakul, Sha Fu, 13 May 2014, doi:10.1002/col.21894,
Color Research & Application, Volume 40, Issue 4, p. 374. http://onlinelibrary.wiley.com/doi/10.1002/col.21894/pdfArchived 8 October 2017 at the Wayback Machine "The usual definition of achromatic color is 'a perceived color without hue.' The colorimetric definition is that of an object with a flat reflectance function at a given level of reflectance, or one of its metamers."
