Dec 1, 2017 | Characterization, Glossary of Spectroscopy Terms, Software
The 1932 CIE chromaticity diagram is one way to objectively describe color. The three components of human color perception (red, green, and blue) can be transformed to another three dimensional space where one axis is radiance/luminance independent of chromaticity and...
Dec 1, 2017 | Characterization, Glossary of Spectroscopy Terms, Software
Purity, which is equivalent to saturation when talking about xy chromaticity, describes how “pure,” or monochromatic, a color is at a given lightness. For example, consider all spectra with a lightness of 50. The spectrum could be composed of equal intensities of all...
Dec 1, 2017 | Characterization, Glossary of Spectroscopy Terms, Software
Delta E is an equation to describe the difference between two colors when using the CIE L* a* b* graph. It is defined as follows: As a general rule of thumb, a delta E of one is barely perceptible and a delta E greater than three means two different colors. However,...
Dec 1, 2017 | Characterization, Glossary of Spectroscopy Terms, Software
The correlated color temperature is another way to describe a light source’s color point on the 1932 CIE chromaticity diagram. It compares the color to that of a blackbody source heated to a certain temperature. For example, light bulbs are described as 2700K, 5000K,...
Dec 1, 2017 | Glossary of Spectroscopy Terms, Software
Episodic Data Capture is a tool in the SpectraWiz software that can be used to capture spectra over a certain time period. It can be found under the “Setup” menu. For example, it could be set up to capture a spectrum every second while a reaction is occurring to...
Dec 1, 2017 | Characterization, Glossary of Spectroscopy Terms, Software
Chroma describes how pure, or monochromatic, a color is compared to a white surface with the same illumination. For example, if a white surface is illuminated with 0.1W m-2 nm-1, the irradiance spectrum will also show 0.1W m-2 nm-1 at all visible wavelengths...