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Isn’t CIELUV more-or-less deprecated now, in favour of CIELAB? Is there a reason that HSLuv is based on the former (and isn’t “HSLab” instead)?

by pansa2 7y ago

mark-r 7y ago
I've never figured out why LAB and LUV both exist, they were created around the same time to solve the same problem. LAB is definitely more popular though.
- hug 7y ago
  CIE recommend the use of LAB for paints/dyes/surfaces, and LUV for displays. I don't know why. I just know they do. If I had to guess, it would be that LUV is designed for additive mixing, and LAB is not, but that is a guess educated by some dimly remembered early highschool physics along with 4th grade art lessons.
  - mpetroff 7y ago
    This is a common misconception; both were recommended because they performed equally well on available data at the time [1]. While CIELUV does have the advantage that additive mixtures fall on straight lines in its chromaticity diagram, it does poorly at predicting color differences and has a flawed adaptation transform, so CIELAB is generally preferred. [1] https://doi.org/10.1002/col.5080150308 https://doi.org/10.1002/col.5080150308
deltron3030 7y ago
AB coordinates are a bit unintuitive, it's easier to visualize hues around a circle and have separate values for luminance and chroma, that's why people who work with color usually prefer LCH/HCL (Luminance, Chroma, Hue). Chroma values in LCH differ between Hues, because each Hue has a different potential and max value. That's where HSLuv comes in, where chroma is a percentage value and therefore relative to the Hue, instead of an absolute one. This gives HCL similar usage ergonmics like HSL, thus the name HSLuv.
- pansa2 7y ago
  But it’s possible to construct an LCh color space from either CIELAB or CIELUV. Why choose the one that’s less widely-used?
  - deltron3030 7y ago
    Sure, but chroma is absolute in LCh, which makes it hard to use for color generation. 100% chroma in HSLuv is the highest value of a particular hue in LCh.

Isn’t CIELUV more-or-less deprecated now, in favour of CIELAB? Is there a reason that HSLuv is based on the former (and isn’t “HSLab” instead)?

by pansa2 7y ago

Isn’t CIELUV more-or-less deprecated now, in favour of CIELAB? Is there a reason that HSLuv is based on the former (and isn’t “HSLab” instead)?

mark-r 7y ago

I've never figured out why LAB and LUV both exist, they were created around the same time to solve the same problem. LAB is definitely more popular though.

hug 7y ago
CIE recommend the use of LAB for paints/dyes/surfaces, and LUV for displays. I don't know why. I just know they do. If I had to guess, it would be that LUV is designed for additive mixing, and LAB is not, but that is a guess educated by some dimly remembered early highschool physics along with 4th grade art lessons.
- mpetroff 7y ago
  This is a common misconception; both were recommended because they performed equally well on available data at the time [1]. While CIELUV does have the advantage that additive mixtures fall on straight lines in its chromaticity diagram, it does poorly at predicting color differences and has a flawed adaptation transform, so CIELAB is generally preferred. [1] https://doi.org/10.1002/col.5080150308 https://doi.org/10.1002/col.5080150308

deltron3030 7y ago

AB coordinates are a bit unintuitive, it's easier to visualize hues around a circle and have separate values for luminance and chroma, that's why people who work with color usually prefer LCH/HCL (Luminance, Chroma, Hue). Chroma values in LCH differ between Hues, because each Hue has a different potential and max value. That's where HSLuv comes in, where chroma is a percentage value and therefore relative to the Hue, instead of an absolute one. This gives HCL similar usage ergonmics like HSL, thus the name HSLuv.

pansa2 7y ago
But it’s possible to construct an LCh color space from either CIELAB or CIELUV. Why choose the one that’s less widely-used?
- deltron3030 7y ago
  Sure, but chroma is absolute in LCh, which makes it hard to use for color generation. 100% chroma in HSLuv is the highest value of a particular hue in LCh.