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Sources for BRDF and BSDF Equipment and Testing Services

How is polarization minimized in HunterLab sphere instruments?

Directional Instruments

Measuring Visual Differences with dE CMC

Metamerism Index

Measuring the Color of Olive Oil

Human Observers

Objects

Light Sources and Illuminants

How do you quantify color?

What is a visual limit for Haze%?

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Blogs

Sources for BRDF and BSDF Equipment and Testing Services

Posted on July 1, 2014 by Ken Phillips

In industrial colorimetry of QA non-luminous materials, assumptions are made that light reflected from or transmitted through a surface is relatively uniform, with only diffuse and specular components. To promote inter-instrument agreement, the CIE geometries for collecting the reflected or transmitted signal of non-luminous materials are standardized into directional and diffuse sphere types. BRDF measurement serves as more of a […]

Posted in Color and Appearance Theory Tagged BRDF, light scattering pattern Leave a comment

How is polarization minimized in HunterLab sphere instruments?

Posted on April 2, 2014 by Ken Phillips

FAQ: “Do you sell a depolarizer for my HunterLab sphere instrument?  On occasion we test polarized samples and there is definitely a dependence on the orientation of the lens.  I was wondering if adding a depolarizer would eliminate this phenomenon?” Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical […]

Posted in Color and Appearance Theory, UltraScan PRO, UltraScan VIS Tagged polarization, polarize, polarizer Leave a comment

Directional Instruments

Posted on April 1, 2014 by Ken Phillips

  HunterLab manufactures bench top instruments with two different geometry types: directional 45/0 (or 0/45) and diffuse sphere instruments, as discussed in a previous blog note. A 45/0 directional instrument illuminates the sample at a 45˚ angle from the sample surface and the detector is located 0˚ in line perpendicular to the sample surface. The […]

Posted in Color and Appearance Theory, ColorFlex EZ, ColorFlex EZ Citrus, ColorFlex EZ Coffee, ColorFlex EZ Tomato, MiniScan EZ Tagged 0/45, 45/0, gloss, texture Leave a comment

Measuring Visual Differences with dE CMC

Posted on March 25, 2014 by Ken Phillips

Can you see a visual difference between the three samples above? Chances are if you can see a difference between samples then HunterLab instruments can measure and quantify these variances. There are several ways to quantify differences with color measurement. You can evaluate dL* da* and db* values to see how samples vary from a […]

Posted in Color and Appearance Theory Tagged dE CMC, delta E CMC, ellipitical tolerance Leave a comment

Metamerism Index

Posted on March 18, 2014 by Ken Phillips

Why do the samples above look the same under one lighting condition but different under another? These samples exhibit metamerism, which means they match under some lighting conditions but not others. Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. Today, […]

Posted in Color and Appearance Theory Tagged MI Leave a comment

Measuring the Color of Olive Oil

Posted on March 11, 2014 by Ken Phillips

Olive oil is produced by grinding whole olives and extracting the oil by mechanical or chemical means. Olive oil has a wide variety of applications cosmetics, pharmaceuticals, soaps, but most commonly is used in cooking. Can HunterLab instruments accurately determine the quality of olive oils quantitatively? Ken PhillipsMr. Philips has spent the last 30 years […]

Posted in Color and Appearance Theory, Food Tagged haze, olive oil, sediment Leave a comment

Human Observers

Posted on March 4, 2014 by Ken Phillips

This is the final blog note article in our series describing the Visual Observing Situation Model in which we will discuss human observers. Previously we discussed how the illuminants and objects are quantified to help measure color. In the human eye there are rods that are responsible for low light vision and cones that are […]

Posted in Color and Appearance Theory, Uncategorized Tagged 10 degree, 2 degree, observer Leave a comment

Objects

Posted on February 25, 2014 by Ken Phillips

In this series of blog notes we have discussed what is needed to quantify color and how light sources are quantified. The second element of the visual observing model that must be quantified is the object that modifies the white light source. Ken PhillipsMr. Philips has spent the last 30 years in product development and […]

Posted in Color and Appearance Theory, Uncategorized Tagged reflectance, spectral curve, transmittance Leave a comment

Light Sources and Illuminants

Posted on February 18, 2014 by Ken Phillips

The previous blog note discussed the three elements required to see color; a white light source, an object, and a human observer. In order for HunterLab instruments to measure color we need to be able to quantify, or assign numbers, to these three elements. Ken PhillipsMr. Philips has spent the last 30 years in product […]

Posted in Color and Appearance Theory, Uncategorized Tagged D65, illuminant, light source Leave a comment

How do you quantify color?

Posted on February 11, 2014 by Ken Phillips

HunterLab instruments measure the color as it relates to the quality of the product. To be able to begin to measure and quantify color we have to know more about why colors appear as they do. As humans we all see and perceive color differently; this is because the human perception of color is a […]

Posted in Color and Appearance Theory, Uncategorized Tagged illuminant, object, observer, visual observer situation model Leave a comment

What is a visual limit for Haze%?

Posted on February 7, 2014 by Ken Phillips

FAQ: “What is a visual limit for Haze%? When should I be able to see a difference in a sample?” A perfect clear of 0% would be air for transparent solids and the transmission cell of a defined path length filled with DI water for transparent liquids. It should also be noted that the Haze% […]

Posted in Chemical, Color and Appearance Theory, Pharmaceuticals, Plastic, UltraScan PRO, UltraScan VIS Tagged clear, haze, hazey, scattering, total transmission, transmission haze Leave a comment
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