Blogs
Do you know what Molten Color is?
Posted on by Ganesh Ramanathan
FAQ:”A client is asking me to measure something they call “Molten Color’. Do you have any information on this? Do Hunterlab instrument have a function for this color?” Ganesh Ramanathan
Do you have references for the equivalency of CIE inverse instrument geometries?
Posted on by Ganesh Ramanathan
FAQ: “…. the schema of the principle of measuring shows other way of light (source of light -> sample -> sphere -> detector) than our ColorQuest (source of light -> sphere -> sample -> detector). Please can you explain me difference between both construction? difference between both results of measuring?” Ganesh Ramanathan
Can you explain the LabScan XE 0:45 inverted geometry?
Posted on by Ganesh Ramanathan
FAQ: “Straight from the LSXE Pro-forma, the LabScan XE sample ports are described as: Port Insert, 3-mm illuminated area; 5-mm measured area Port Insert, 6-mm illuminated area; 10-mm measured area Port Insert, 13-mm illuminated area; 17-mm measured area Port Insert, 25-mm illuminated area; 30-mm measured area Port Insert, 44-mm illuminated area; 50-mm measured area I […]
Do you have a source for Magnesium Carbonate powder as top-of-scale?
Posted on by Ganesh Ramanathan
For measuring the brightness of some materials, some dated industrial methods cite a Magnesium Carbonate block standard to be set to Y = 100% in reflectance. This is a very old top-of-scale standard and HunterLab does not recommend using it. Ganesh Ramanathan
What are the USDA Peanut Butter Color Standards?
Posted on by Ganesh Ramanathan
The USDA quality system assigns peanut butter quality rating of USDA Grade A, Grade B and Other based on 4 attributes that total 100 points. Ganesh Ramanathan
Do you have a source for calibrated, traceable transmission filters?
Posted on by Ganesh Ramanathan
HunterLab does not supply glass or plastic filter transmission standards but here are some sources. Ganesh Ramanathan
Sources for BRDF and BSDF Equipment and Testing Services
Posted on by Ganesh Ramanathan
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 […]
How is polarization minimized in HunterLab sphere instruments?
Posted on by Ganesh Ramanathan
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?” Ganesh Ramanathan
Directional Instruments
Posted on by Ganesh Ramanathan
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 […]
Measuring Visual Differences with dE CMC
Posted on by Ganesh Ramanathan
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 […]
Metamerism Index
Posted on by Ganesh Ramanathan
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. Ganesh Ramanathan