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> ProPhoto will over-saturate the targets

same RGB DNs used as coordinates with the wider gamut colorspace = more saturated color with narrower gamut = less saturated color... I see ... but then it is a trick where you in fact manipulate the results by using some color space at will, no ? is there any possible metric that can be used on DNs w/o color space assignment ?  something like sqrt ( ( R1 - R2 )^2 + (G1-G2)^2 + (B1-B2)^2  )

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