Colour Making

 

Colours

Each colour you can think of is just a combination of three colours. They are called primary colours. The three primary colours are:

• Red
• Green
• Blue

The following programme lets you make any colour you can think of by mixing the three primary colours in various proportions. You can enter the values for Red, Green and Blue - a number less than 255 - and make various colours. That is how modern computers produce millions of colours using the three primary colours. Thanks to this little programme, you can have some fun too.

 

Here are some exciting values for you to play with:

Red	Green	Blue	Colour
165	42	42	Brown
237	164	61	Crimson
0	0	139	Dark Blue
139	0	0	Dark Red
0	100	0	Dark Green
255	215	0	Gold
75	0	130	Indigo
255	0	255	Magenta
255	165	0	Orange
255	255	0	Yellow
0	128	128	Teal
0	255	255	Cyan
160	82	45	Sienna
128	128	0	Olive
128	128	128	Grey

Now, you can play with the primary colours to produce different colours.

 

Interactive Colour Ball

The animation allows you to use the three primary colours - red, gree and blue - to produce any other colour that you can think of.

In theory, it can produce 16-million colours, depending on the values of red, green and blue.

Red:        0   255

Green:  0   255

Blue:     0   255

The range element does not work with Mozilla Firefox. So, this animation would not work on Firefox.

White Light

White light, consists of seven colours: red, orange, yellow, green, blue, indigo, violet. The acronym - Richard Of York Gave Battle In Vain - sums up that all. The visible spectrum of sunlight consists of these seven colours.

Filters

A colour filter lets its own colour through while absorbing the rest. The following animations shows colour filtering.

Watch the way only the colours of the filters are allowed to go through.

Reflection of Light by paints

The colour of the paint is reflected when white light hits a paint. The following animations show that.

The colour of the paint is taken away from the white light and then reflected. The rest of the colours are absorbed.

Please answer the following questions.

1. A beam of white light falls on a red filter. Which colour will emerge from the filter?
2. A beam of yellow light falls on a red filter. Which colour will emerge from the filter?
3. A beam of yellow light falls on a blue filter. What is the outcome?
4. A beam of yellow light, first falls on a red filter and then on a green one. What will you see?
5. A beam of yellow light falls on a yellow filter at first, then a green filter. What will you see?
6. A beam of white light hits a red surface and then goes through a green filter. What will you see?
7. A beam of red light hits a green surface. What will happen?