What are composite colours?
a. Colours produced by mixing two or more primary colours, in proper proportions.
b. Colours which combine easily with primary colours
c. Tertiary colours when mixed in proper proportions
d. None of these

Hint: Blue, green and red are known to be the three primary colours. By mixing these colours we obtain all the other colours. Combining these three primary colours, the result formed is a colour image, in which each pixel’s colour is determined by combination of the primary colours. Using the above statement define composite colours.

Complete step by step answer:
Three different bands are composed in computer screens while displaying an image. These three bands are formed by using the primary colour in each band. Combining these three primary colours, the result formed is a colour image, in which each pixel’s colour is determined by combination of the primary colours. One band at a time can be displayed in each band of a multispectral. Otherwise a combination of three bands at a time will form a colour one band.

Representation of a multispectral image generated using bands which are other than red, green and blue components of the display is called false colour. False colour helps us to visualize wavelengths that the human eye can’t see. Different false coloured composites are used to highlight different features.

Red, blue and green are the three primary colours. By mixing these colours we obtain all the other colours. White is produced when the primary colours are mixed in proper proportions. Composite colour is when any other colour produced when mixing two or more primary colours in different proportions.

Hence, the correct answer is option (A).

Note: Bands as near infrared highlights the differences in the spectrum and interpretability of the data increases often. White is produced when the primary colours are mixed in proper proportions. . Combining these three primary colours, the result formed is a colour image, in which each pixel’s colour is determined by combination of the primary colours.