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Imaging Spectral Colorimeter

Westboro Photonics WP214 Imaging Spectral Colorimeter

The Westboro Photonics WP214 is an imaging spectral colorimeter that combines the accuracy of a spot spectroradiometer with the productivity of an imaging colorimeter in one instrument.

Westboro Photonics WP214 Imaging Spectral-Colorimeter

The WP214 provides the accuracy of a spot spectroradiometer combined with the productivity of an imaging colorimeter in one instrument. The WP214 is the highest accuracy 2D colorimeter available on the market. The built-in spot spectroradiometer provides automatic photometric and colorimetric correction for the 2D colorimeter. The optical design of the WP214 has superior 2D colour accuracy than any other imaging colorimeter for two important reasons:

  1. The precision optics collimate the light through the tristimulus filters providing equivalent filtering for all areas of the image.
  2. The integrated spot spectroradiometer samples 5% of the field of view, and provides corrections for the colorimeter.

The instrument is even more practical for the lab when one considers the interchangeable specialty lens options including macro, microscope and fisheye lenses. When coupled with a Westboro CONOMETER® lens, the WP214 can measure luminance and chromaticity as a function of viewing angle with a range of 160° and a data resolution of 0.25°.

Measurement Capabilities

The following photometric and colorimetric parameters can be measured using a WP214 imaging colorimeter:

  • Spatial luminance (candelas per square meter, cd/m2)
  • Spatial illuminance (lux, lx)
  • Source luminous intensity (candelas, cd)
  • OPTIONAL view angle (requires CONOMETER lens)
  • Spatial CIE chromaticity (1931 xy, 1960 uv, 1976 u'v' & L*a*b*)
  • Colour gamut
  • Gamma
  • Spatial correlated colour temperature (CCT, Kelvin and Duv)
  • Spatial dominant wavelength (nm)
  • OPTIONAL radiometric measurements (radiance & irradiance)


The WP214 merges a high accuracy spot spectroradiometer with the advanced analysis capabilities and large field of view associated with imaging tristimulus colorimeter systems. The system features a high dynamic range, cooled CCD imager with 0.5MP resolution and an integrated spectroradiometer which serves as the reference to correct the imager results. An automated filter wheel contains four tristimulus filters and five optional positions.

The combination of these two technologies ensures high accuracy and increased productivity. In many cases the WP214 can replace two separate instruments. The instrument is even more practical for the lab when one considers the multitude of interchangeable lens options. When coupled with the CONOMETER® lens for example, the WP214 can measure viewing angle as a function of luminance and chromaticity with angular data out to ±80°. 

Matched Lenses

Each colorimeter has a lens that is matched to the sensor resolution and size, providing optimally crisp and clear images. By matching a lens to a particluar sensor, the images created using a Westboro colorimeter can be of a higher quality that supposedly higher resolution cameras without matched lenses.

Automatic Colour Correction

The WP214 has the benefit of a spot spectroradiometer and an imaging colorimeter integrated in the same instrument. The imaging colorimeter’s accuracy is improved to the level of the spectroradiometer by automatic correction. The spectral data also provides radiometric information and other measurement insights.

Any filter-based colorimeter suffers from a degree of measurement error when tasked with measuring a light source whose spectral power distribution differs from the blackbody spectrum with which the colorimeter is calibrated. This error can be reduced by employing additional narrow band filters (for example, Westboro employ two blue filters, one matched to the X observer and the other to the XB function), but no matter how many filters are used, errors remain when the device under test (DUT) does not exhibit a blackbody type spectrum. The error is largest when measuring narrow linewidth sources, for example lasers, phosphor white and RGB LEDs, LCDs and white LEDs filtered through coloured plastic appliques. If your tests require verification of an target colour in your DUT, the integrated spectroradiometer in the WP214 colorimeters ensures the highest possible absolute colorimetric accuracy.

Radiometric & Other Capabilities

Upon request, a WP6 Series CCD imaging colorimeter can be factory configured with a radiometric filter, which provides for measurements of irradiance and radiance. The radiometric filter replaces the standard phoopic filter, and extends the wavelength sensitivity of the camera to that of the CCD sensor, 350-1000nm. Calibration of the imaging radiometer must be performed by the user with reference to a spot spectroradiometer which is used to measure the output from the device under test. Other optionally available filters match the scotopic and circadian spectral sensitivities; IR and custom filters are also available.

Capable Software

Photometrica® software and optional software packages provide extensive options for measurement and analysis. The optional Photometrica Software Development Kit (SDK) allows for the creation of fully customised solutions using built-in scripting or external control. Click here for further details on Phometrica software.


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