Photometrica Software – Measurement

Live Preview and Image Capture

Photometrica offers a complete set of controls for both the live preview and capture of measurements. Align and focus the instrument via the Preview function’s live video stream, while the Capture Editor manages the key measurement parameters such as exposure time.

Luminance

All Westboro Photonics imaging photometers and colorimeters measure luminance (Y) at high spatial resolution. Other photometric quantities that can be derived from luminance (cd/m2 or fL) include luminous intensity (cd) and partial luminous flux (lm).

Color

View chromaticity measurements in color space diagrams such as (x, y), (u’, v’), and various plots within Photometrica Software.

  • color coordinates (x, y), (u’, v’)
  • tristimulus values (X, Y, Z)
  • dominant wavelength
  • purity
  • correlated color temperature (CCT)

Westboro Photonics imaging colorimeters come standard with four special filters to match the tristimulus functions: two for X (Xblue and Xred) and one for each of Y and Z. For speed-optimized production applications a three-filter solution, where the Xblue component is estimated from Z, is supported.

Additional Filter Support

Photometrica supports other filters installed in photometers and colorimeters for various applications. Filter types include: scotopic, radiometric, bandpass, shortpass or longpass, ipRGC, S cone, M cone, and L cone.

Computed Measurements

Available computed quantities include:

  • Illuminance
  • Luminous Intensity
  • Luminous Flux
  • Radiance
  • Spectral Radiance
  • Irradiance
  • Radiant Intensity
  • Radiant Flux
  • CIE Chromaticity Coordinates (xy and u’v’)
  • Correlated Color Temperature (CCT)
  • Dominant Wavelength
  • Purity
  • ΔE*ab
  • Contrast
  • Gamma and gamma inversion
  • Custom computations can be generated to compute user-specified measurement components on a pixel-wise basis

Spectral Measurements

The WP6ES and WP214 imaging colorimeters, the WP6PES imaging photometers, and optionally the MCIC colorimeters have an integrated spot spectroradiometer providing automatic color correction, and markedly improving accuracy. Benefit from fast spectral preview, spectral radiance graphing, tabulated measurement results from the spectra, and more.

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