Colour Measurement

Accurate measurement of colour is possible with digital imaging systems.  New techniques provide the necessary precise calibration of monochrome and colour digital cameras.

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Accurate colour measurement has usually relied upon instruments such as colorimeters.  Colorimeters measure colour accurately over a sample area--the measurement indicates the "average" colour over the sample area.  When the sample has colour variations within it, important colour information is lost when a colorimeter is used.

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Biscuit image, portion averaged to constant colour
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A colorimeter measures average colour but a digital imaging system gives detailed colour information.

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Simulated colorimeter response--average colour over sample area.

True image data used by digital imaging system.

 
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A digital imaging system records the colour at thousands, or even millions, of points in the sample--each pixel records a separate colour measurement.  This provides much more detailed information about the colour of the sample.  A digital image can be used to measure not only the average colour, but also the colour distribution within the sample. 

The benefits of digital imaging can only be realised if the imaging system is calibrated to produce accurate colour data.  Hamey Vision Systems are experienced in using digital imaging systems for accurate colour measurement.

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