Seonglae ChoWhen representing a Color Space as a cone, hue is the rotation, saturation is the radius, and brightness is the height axis.
The human eye is more sensitive to luminance components than color components. This means that if the contrast is matched correctly, people will hardly notice if colors are slightly faded. That's why subsampling is often used to compress by reducing the color difference information (Cb, Cr) while preserving the brightness information (Y) that humans are more sensitive to. Colors with 24 bits or more are called true colors.
Wavelength 가 prism 에 not fully separated, artists call this warm and cool colours. When we open the Parenthesis,
Color Spaces Notion
Color Spaces
- Isaac Newton’s circle, 1704 (approximation)
- Otto Runge’s sphere, 1810
- Jame Clerk Maxwell’s triangle, 1855
- Herman von Helmholtz diagram, 1867 (approximation)
- William Benson’s cube, 1868
- August Kirschmann’s double cone, 1895
- Erwin Schrodinger’s non-Euclidean space, 1920
- David MacAdam’s Coptimal solid (CIE XYZ), 1935
- This object theoretically contains all colours that can be observed up to a certain luminosity.
- CIELAB, 1976
- sRGB, 1996
- Depending on the intensity of these three lights, the screen can synthesize colours within a triangle, or a cube, in three dimensions.
- These colours are enough for most images, but we do miss some very vivid ones, such as those we see during a Sunset.
- CIECAM97s, 1997
- CIECAM01, 2002
- iCAM06, 2006
- SRLAB2, 2009
- CIECAM, 2016
The "Geometry" of Colours, from Newton to Schrödinger...
What are colours? Do they form a particular geometry? Can we build this geometry from our perceptions? All the answers in 20 minutes!
0:00 - Introduction
1:07 - What is a colour?
2:03 - Newton's disc
6:02 - The XYZ space
8:49 - Screens and vision
12:09 - Psychological approach
17:07 - Conclusion
Link to the game mentioned at 13:00: http://colors2.alessandroroussel.com/
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This video is narrated by Octave Masson.
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Alessandro Roussel,
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Sources and bibliography:
https://www.researchgate.net/publication/367216474_Helmholtz_and_the_geometry_of_color_space_gestation_and_development_of_Helmholtz's_line_element
https://www.researchgate.net/publication/377372066_Helmholtz_Schrodinger_and_the_First_Non-Euclidean_Model_of_Perceptual_Color_Space
https://link.springer.com/content/pdf/10.1007/s00407-023-00317-x.pdf
https://www.gutenberg.org/files/33504/33504-h/33504-h.htm
http://www.gutenberg-e.org/lowengard/A_Chap03.html
https://royalsocietypublishing.org/doi/epdf/10.1098/rstl.1802.0004
https://pubmed.ncbi.nlm.nih.gov/17026602/
https://www.eizo.com.cn/global/library/EIZO_DCH_APPENDIXA.pdf
https://www.jcgt.org/published/0014/01/01/paper.pdf
http://www.color-theory-phenomena.nl/08.00.html
https://rmit.pressbooks.pub/colourtheory1/chapter/modern-era-c-1850-to-1980/
https://pteromys.melonisland.net/munsell/
https://www.webexhibits.org/colorart/ganglion.html
https://www.icst.pku.edu.cn/mipl/docs/F8A22B42-BDB9-137E-C51F5F9B422FE985_49512.pdf
https://www.pnas.org/doi/full/10.1073/pnas.2119753119
https://www.science.org/doi/10.1126/sciadv.adu1052
https://youtu.be/7KYwi2F5Ce4?si=hDXJwrHP8dGl1hGn
HSL and HSV - Wikipedia
HSL (for hue, saturation, lightness) and HSV (for hue, saturation, value; also known as HSB, for hue, saturation, brightness) are alternative representations of the RGB color model, designed in the 1970s by computer graphics researchers to more closely align with the way human vision perceives color-making attributes.
https://en.wikipedia.org/wiki/HSL_and_HSV
