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This tool looks like it employs the Munsell color space, invented by Albert Munsell, one of the Demi-gods of color science. Munsell was a painter, and a pretty

by Daub 6y ago

This tool looks like it employs the Munsell color space, invented by Albert Munsell, one of the Demi-gods of color science. Munsell was a painter, and a pretty good one. He was frustrated by the arbitrary naming of artists paints, so he set out to develop a perception-based system of his own. It was based on two principles: ‘smallest perceivable difference’ and ‘pair-wise comparison’. Using this, and hundreds of test subjects, he mapped perceptual color space. Until then, it had been assumed it was spherical. He showed it for what it really was: lumpy and uneven. Also, fundamentally non-Euclidean. A true pioneer.

microcolonel 6y ago
As a 13 year old, I read this paper [0] by Lorenzo Ridolfi when it came out and it really inspired me to explore stuff like this. Every few years I'm reminded of it and I try recreating the programs outside of MATLAB. The 3D manifolds he creates are really fantastic, you can see the nonlinearity of human vision causing wrinkles in the surface where optimization breaks down. [0]: https://www.semanticscholar.org/paper/Investigating-Euclidean-Mappings-for-CIEDE2000-Ridolfi-Gattass/491a679b7506b3b242ba7d5b2c2ce62d9b80af63 https://www.semanticscholar.org/paper/Investigating-Euclidea...
- Daub 6y ago
  Will Certainly check that paper out. 13 years old? Pretty precocious. A great book to read on the subject of color spaces is ‘color space and its divisions: Color Order from Antiquity to the Present’ by Rolf Kuehmi. I have read just about every major book on color there is, and this one is easily amongst the best. Written in plain English and with great insight. Go with him to a place beyond RGB.
  - jimhefferon 6y ago
    Thanks for the reference. It is a subject I would like to know more about. Let me comment, though, that I've never before seen a review that says that a book from a reputable publisher is bound with the pages at random: https://www.amazon.com/Color-Ordered-Systems-Antiquity-Present/dp/019518968X https://www.amazon.com/Color-Ordered-Systems-Antiquity-Prese... . In addition I see that there are three reviews, two 5's and a 1, and Amazon says "5 star" is 53%. Hmmm.
diiq 6y ago
Munsell's amazing! This similar to Munsell, but where his space was based on specific, literal sample colors, this one is based on a mathematical model -- but the experiments to determine that model were remarkably similar to his! The core model is CIE Lab: https://en.wikipedia.org/wiki/CIELAB_color_space https://en.wikipedia.org/wiki/CIELAB_color_space The a and b* parameters of that model are not totally intuitive, though; luckily, the same space expressed in polar coordinates has parameters that map really well to the same hue, chroma, and lightness that Munsell organized with.
- Daub 6y ago
  I have used Lab space in Photoshop a bit. You are right... it is a relative to Munsell. Lab has one or two very particular uses in color adjustment. For example... as lightness is completely separate to chromacity, it is a very agreeable space for lightness and saturation adjustments. It is also great for demonstrating to students how the perceptual Lightness value of a hue differs to the lightness value indicated by a desaturation in simple RGB space.

by Daub 6y ago

microcolonel 6y ago

As a 13 year old, I read this paper [0] by Lorenzo Ridolfi when it came out and it really inspired me to explore stuff like this. Every few years I'm reminded of it and I try recreating the programs outside of MATLAB. The 3D manifolds he creates are really fantastic, you can see the nonlinearity of human vision causing wrinkles in the surface where optimization breaks down. [0]: https://www.semanticscholar.org/paper/Investigating-Euclidean-Mappings-for-CIEDE2000-Ridolfi-Gattass/491a679b7506b3b242ba7d5b2c2ce62d9b80af63 https://www.semanticscholar.org/paper/Investigating-Euclidea...

Daub 6y ago
Will Certainly check that paper out. 13 years old? Pretty precocious. A great book to read on the subject of color spaces is ‘color space and its divisions: Color Order from Antiquity to the Present’ by Rolf Kuehmi. I have read just about every major book on color there is, and this one is easily amongst the best. Written in plain English and with great insight. Go with him to a place beyond RGB.
- jimhefferon 6y ago
  Thanks for the reference. It is a subject I would like to know more about. Let me comment, though, that I've never before seen a review that says that a book from a reputable publisher is bound with the pages at random: https://www.amazon.com/Color-Ordered-Systems-Antiquity-Present/dp/019518968X https://www.amazon.com/Color-Ordered-Systems-Antiquity-Prese... . In addition I see that there are three reviews, two 5's and a 1, and Amazon says "5 star" is 53%. Hmmm.

diiq 6y ago

Munsell's amazing! This similar to Munsell, but where his space was based on specific, literal sample colors, this one is based on a mathematical model -- but the experiments to determine that model were remarkably similar to his! The core model is CIE Lab: https://en.wikipedia.org/wiki/CIELAB_color_space https://en.wikipedia.org/wiki/CIELAB_color_space The a and b* parameters of that model are not totally intuitive, though; luckily, the same space expressed in polar coordinates has parameters that map really well to the same hue, chroma, and lightness that Munsell organized with.

Daub 6y ago
I have used Lab space in Photoshop a bit. You are right... it is a relative to Munsell. Lab has one or two very particular uses in color adjustment. For example... as lightness is completely separate to chromacity, it is a very agreeable space for lightness and saturation adjustments. It is also great for demonstrating to students how the perceptual Lightness value of a hue differs to the lightness value indicated by a desaturation in simple RGB space.