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I describe an earlier and perhaps better approach in detail in two of my RG posts namely “Measuring the contribution of texture to colour appearance” 1998, and ”Computer systems for the specification and communication of colour” 2009. When the task is simply to quantify the difference between images, a simple solution is available via Adobe Photoshop and ICC (International Colour Council) colour profiling.
The key of course is a computer model that correctly maps RGB pixel values onto HCL perceptual colour values or the less intuitive CIE L*a*b* colour space co-ordinates.
A good solution would be to specify each image as a set of R,G,B quantified pixels and characterise the resulting populations in terms of their spectral Hue, Chroma (or purity) and Lightness.
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