OK, the Mirror toady tickled another pet-hate which allowed me to do a bit of ‘moan-therapy’:
To: r.sayid -at- mirror.co.uk From: me Interestingly your article on parents helping kids with their homework itself contained an error in the answer to one of your questions. You asked 'What are the primary colours?' and gave the answer 'Red, Blue and Yellow'. This is actually incorrect. The correct answer is 'Red, Green and Blue'. This can be verified by looking closely at your computer monitor or TV screen and noticing that all the colours are actually made up of red, blue and /green/ dots. Similarly when selecting colours in a computer programme you have red, green and blue sliders. For more information see [1]. Quoting: A primary colour is a colour that cannot be created by mixing other colours in the gamut of a given colour space. Primary colours may themselves be mixed to produce most of the colours in a given colour space. Traditionally, the colours red, yellow, and blue are considered to be primary pigments. This is simply incorrect, however. There do exist the 'secondary' or 'subtractive primary' colours which are cyan, magenta and yellow which are often (again, incorrectly) stated to be red, blue and yellow when talking about pigments. Indeed your own paper is printed using the three colours cyan, magenta and yellow so how can it claim that the primary colours are a totally different set? Perhaps Mirror journalists shouldn't help their readers with their homework either. :) [1] http://en.wikipedia.org/wiki/Primary_color -- Rich Wareham Signal Processing Laboratory Univsersity of Cambridge Engineering Department