What are the three basic colours that monitors transmit?
The colours are "Primary" not basic, they are Red, Green & Blue. On a monitor, or a TV, these are additional colours.
How many different colours are there in the web-safe palette?
24
Web colours are colours used in designing web pages, and the methods for describing and specifying those colours. Colours may be specified as an RGB triplet or in hexadecimal format. A colour is specified according to the intensity of its red, green and blue components, each represented by eight bits. There are 24 bits used to specify a web colour.
Are the majority of people we refer to as colour blind unable to see colour at all?
Colourblindness refers to the inability to see colour. True colourblindness is rare as most people are able to see some degree of colour.
What is the key to designing sites that are accessible to people who are colour blind?
Most of the time when people put images on the web, the fact that they are in color at all is irrelevant. It may be nicer to see the colors, but the viewer can understand the image just fine even with all of the colors removed. If, however, the purpose of posting the image is to communicate something about the colors in that image, then it is important to provide some other way of understanding the information.
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