Presentation on theme: "Image and Sound Representation"— Presentation transcript

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Colour depth

The number of bits used to represent each colour is called the colour depth. An 8 bit colour depth means that each pixel can be one of 256 colours (because 28 = 256). Modern computers have a 24 bit colour depth, which means over 16 million different colours can be represented With x pixels, 2x colours can be represented as a generalisation. Increasing colour depth also increases the size of the file when storing an image.

Resolution

• A Bitmap image is made up of a grid of pixels.
• An image could be 600 pixels wide by 400 pixels high.
• The resolution of this image would be 600X400.
• If the resolution is increased the quality, not the physical size, is increased and it takes up more of memory to store it.

Making an image file

• For a picture of a flower four colours are used. These numbers are represented as binary.
• The number of bits we use dictates how many colours we could use. If we wanted to store more than 4 colours we would have to use more than 2 bits.

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