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The syntax for a color vector is...
rgb rgbf rgbt rgbft ] <5_Term_Vector>
...where the vectors are any valid vector expressions of 3, 4 or 5 components. For example
color rgb <1.0, 0.5, 0.2>
This specifies a color whose red component is 1.0 or 100% of full intensity. The green component is 0.5 or 50% of full intensity and the blue component is 0.2 or 20% of full intensity. Although the filter and transmit components are not explicitly specified, they exist and are set to their default values of 0 or no transparency.
The rgbf keyword requires a four component vector. The 4th component is the filter component and the transmit component defaults to zero. Similarly the rgbt keyword requires four components where the 4th value is moved to the 5th component which is transmit and then the filter component is set to zero.
The rgbft keyword allows you to specify all five components. Internally in expressions all five are always used.
Under some circumstances, if the vector expression is a 5 component expression or there is a color identifier in the expression then the rgbtf keyword is optional.
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