CCM Lab value
0 likes1,119 views
The document discusses the CIE L*a*b* color space, which provides a way to numerically specify and communicate colors. It originated from Hunter's Lab color space model from the 1940s and was updated by CIE in 1976 as CIELAB. L* represents lightness on a black to white scale, while a* and b* represent the color's position between red/green and yellow/blue. Positive a* values indicate more red and positive b* values indicate more yellow. The document uses examples to illustrate how L*a*b* values correspond to specific colors.
CCM Lab value
- 1. 5/18/2020 LAB Color Space and Values | X-Rite Color Blog https://www.xrite.com/blog/lab-color-space 1/5 LAB Color Values Posted October 08, 2018 by Tim Mouw Like geographic coordinates – longitude, latitude, and altitude – L*a*b* color values give us a way to locate and communicate colors. What’s the history of L*a*b*? In the 1940’s, Richard Hunter introduced a tri-stimulus model, Lab, which is scaled to achieve near uniform spacing of perceived color differences. While Hunter’s Lab was adopted as the de facto model for plotting absolute color coordinates and differences between colors, it was never formally accepted as an international standard. Thirty-one years later, the CIE published an updated version of Hunter’s Lab: CIELab. The correct way to pronounce it is “see-lab”, or “L-star, a-star, b-star,” but some applications and instruments simply call it L, A, B, or Lab. What does L*a*b* stand for? Regardless of the which color space name you call it, it’s important to know what L*, a*, and b*stand for. L*: Lightness a*: Red/Green Value b*: Blue/Yellow Value As an example, see figures 17 and 18, showing the color-plotting diagrams for L*a*b*.
- 2. 5/18/2020 LAB Color Space and Values | X-Rite Color Blog https://www.xrite.com/blog/lab-color-space 2/5 The a* axis runs from left to right. A color measurement movement in the +a direction depicts a shift toward red. Along the b* axis, +b movement represents a shift toward yellow. The center L* axis shows L = 0 (black or total absorption) at the bottom. At the center of this plane is neutral or gray. To further demonstrate how L*a*b* values represent specific colors, see flowers A and B, below. We’ve also plotted their values on the CIELAB Color Chart above.
- 3. 5/18/2020 LAB Color Space and Values | X-Rite Color Blog https://www.xrite.com/blog/lab-color-space 3/5 We hope these examples help you better understand L*a*b* color space. If you have more questions about color spaces or methods of color communication, contact our team of experts (/contact-us/contact-us-form)– we’re happy to help! Posted in Automotive (/blog/categories/automotive) Color Basics (/blog/categories/color-basics) Color Innovation (/blog/categories/color-innovation) Design (/blog/categories/design) Device How-To (/blog/categories/device-how-to) Our Favorite Blogs (/blog/categories/our-favorite-blogs) Paint and Coatings (/blog/categories/paint-and-coatings) Plastics (/blog/categories/plastics) Print and Packaging (/blog/categories/print-and-packaging) Technical Help (/blog/categories/technical-help) Textiles (/blog/categories/textiles) Tradeshows and Events (/blog/categories/tradeshows-and-events)
- 4. 5/18/2020 LAB Color Space and Values | X-Rite Color Blog https://www.xrite.com/blog/lab-color-space 4/5 Tags: L*a*b* Color Space (/blog?tag=L*a*b* Color Space) Color Space (/blog?tag=Color Space) Color Values (/blog?tag=Color Values) Color Communication (/blog?tag=Color Communication) Color Measurement (/blog?tag=Color Measurement) Categories Automotive (/blog/categories/automotive) Color Basics (/blog/categories/color-basics) Color Innovation (/blog/categories/color-innovation) Design (/blog/categories/design) Device How-To (/blog/categories/device-how-to) Our Favorite Blogs (/blog/categories/our-favorite-blogs) Paint and Coatings (/blog/categories/paint-and-coatings) Plastics (/blog/categories/plastics) Print and Packaging (/blog/categories/print-and-packaging) Remote Color Management (/blog/categories/remote-color-management) Technical Help (/blog/categories/technical-help) Textiles (/blog/categories/textiles) Tradeshows and Events (/blog/categories/tradeshows-and-events) Archive 2020 2019 2018 2017 2016 2015 Tagcloud spectrophotometer (/blog?tag=spectrophotometer) Color Management (/blog? tag=Color+Management) color measurement (/blog?tag=color+measurement) color perception (/blog? tag=color+perception) metamerism (/blog?tag=metamerism) PantoneLIVE (/blog?tag=PantoneLIVE) light booth (/blog? tag=light+booth) color matching (/blog?tag=color+matching) packaging (/blog?tag=packaging) tolerancing (/blog? tag=tolerancing) color communication (/blog?tag=color+communication) plastics (/blog?tag=plastics) digital color (/blog? tag=digital+color) Pantone (/blog?tag=Pantone) calibration (/blog?tag=calibration) ColorCert (/blog?tag=ColorCert) Ci7800 (/blog?tag=Ci7800) Color iQC (/blog?tag=Color+iQC) NetProfiler (/blog?tag=NetProfiler) standards (/blog?tag=standards)
- 5. 5/18/2020 LAB Color Space and Values | X-Rite Color Blog https://www.xrite.com/blog/lab-color-space 5/5 © 2020 X-Rite, Incorporated. All rights reserved. Popular Posts How to Calibrate your Monitor in 10 Steps (/blog/how-to-calibrate-your-monitor) Spring Color Update: The Psychology of Pastels (/blog/spring-color-update-psychology-of-pastels) Additive vs. Subtractive Color Models (/blog/additive-subtractive-color-models) Munsell Color Standards (/blog/munsell-color-standards) Colorimeter vs. Spectrophotometer (/blog/colorimeter-vs-spectrophotometer) View more (/blog?sort=pageviews)