Colour temperature

Therefore a sculpture which responds only to light can use the variables of orientation, polarization, intensity, colour, temperature, stiffness and programmed obsolescence. 

For recording of the emission spectrum, the emitted radiation is focussed on the slit of a monochromator and intensities measured attach wavelength. Since sensitivities of photocells or photomultipliers are wavelength dependent, a standardization of the detector-monochromator combination is necessary for obtaining true emission spectrum This can be done by using a standard lamp of known colour temperature whose emission characteristics is obtained from Planck s radiation law. The correction term is applied to the instrumental readings at each wavelength. Very often substances whose emission spectra have been accurately determined in the units of relative quanta per unit wavenumber intervals are... 

Theoretically one may calculate the number of quanta available from a flash of known energy and colour temperature. If the colour temperature is 6000 K, from Planck s radiation law it can be estimated that 12%... 

Finlayson G and Hordley S 2001a Colour signal processing which removes illuminant colour temperature dependency. UK Patent Application GB 2360660A. 

The major drawback of the system YAG Ce is the decrease in overall efficiency upon lowering the colour temperature. 

We often measure the temperature of solid or liquid substances at high temperature by comparing them with the brilliancy or colour of the black body. This value does not show the true temperature of the substance, but this method is quite favourably used because we have no other simple method like this. The temperature which is measured by the comparison with the brilliancy of the black body is called black body temperature or brightness temperature, and with the colour of the black body colour temperature. 

Fig.33) Anyhow we can produce various colours of the fire dust or sparks except blue and green by adjusting the temperature and selecting substances which make up the component material in firework compositions according to the principle of the colour temperature. 

Table 1. Chromaticity coordinates (CIE), correlated colour temperature (CCT) and colour rendering indices (CRI) for common white light sources.

The fire dust or sparks which are produced by iron or carbon create the colour which resembles that of the black body. The colour of the sparks of "Senko-Hanabi" which is caused not only by carbon but also other materials, also resembles the colour of the black body. We feel that the colour of the aluminium fire dust is a little different from the black body. The colour changes from red-orange to yellow, white yellow and silver as the temperature increases, and the locus may be written as the LH line (Fig.33). Anyhow we can produce various colours of the fire dust or sparks except blue and green by adjusting the temperature and selecting substances which make up the component material in firework compositions according to the principle of the colour temperature. 

In the synthesis of the scene, considerable effort was made to achieve realistic and accurate representation and extreme care was taken over the construction of the object, the simulation of the illumination and atmosphere, and the projection of the background. The solid models were not only correctly painted but were carefully textured relative to their full-scale equivalent. Correct illumination, at the right intensity, was achieved for most applications by a mixture of directional and diffuse lighting but a great deal of trouble also had to be taken to ensure that it was the right colour temperature (see glossary). Atmospheric effects were found to be particularly difficult to calculate and recreate. 

Colour temperature A standardised value for the colour balance of light sources derived by relating the colour of the light radiating from a heated black box radiator, such as a... 

Colour temperature conversion filters TL/TK. (TL = day light, TK = artificial light)... 

As well as additive and subtractive colour filters, there are also colour temperature conversion filters for natural and artificial light applications. Figure 33 shows an example of such filters. 

Colour spaces used to represent colours numerically must specify then-light source. Lab colour measurements, unless otherwise noted, assume that the measurement was taken under a D65 light source, or Delight 6500 K , which is roughly the colour temperature of sunlight. 

Wavelength range (i/pm) Wavenumber range (cl era ) Colour temperature (r/K) ... 

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