4. Data Representation – Images

Starter 

Use the words in the table below to fill-in-the-gaps in the text.  Each word may only be used once.

A bitmap image is created by using a grid of and columns.  Each individual square in the grid is called a ‘ ’.  The more rows and columns that make up the means the more pixels there are available to use in the image.  Think of the level of in the early space invaders sprites compared to the detail in a digital photograph where of pixels are used.

The number of pixels used in a bitmap graphic is referred to as the ‘ ’Colour is assigned to each pixel using numbers.  At the simplest level we can have a colour image, perhaps black and white, with each colour being represented by either a or 0.

For more detailed images such as photographs, over 16 million colours can be made available by 256 shades of red, blue and green.

The amount of colours available to use in an image is called the ‘colour ’.The file of a bitmap graphic is directly related to the colour depth and resolution of the image i.e. the number of colours and pixels that are available to use.

The page is divided into an invisible grid and each pixel is assigned a colour – quality is lost quality when image is made bigger (pixelation). This best describes a   image.

These are drawn by following a set of mathematical instructions – these are scalable don’t lose quality when made larger. This best describes a image.

Task 1 – Colour Depth ( OCR Task)

EXAMPLE (A = 10011001)
B =
C =
D =
E =
F =
G =
H =

Task 2 – Resolution

Q: What is the resolution of the image right?

Answer:  pixels

Use the words in the table below to fill-in-the-gaps in the text.  Each word may only be used once.

A bitmap image is created by using a grid of and columns.  Each individual square in the grid is called a ‘ ’.  The more rows and columns that make up the means the more pixels there are available to use in the image.  Think of the level of in the early space invaders sprites compared to the detail in a digital photograph where of pixels are used.

The number of pixels used in a bitmap graphic is referred to as the ‘ ’Colour is assigned to each pixel using numbers.  At the simplest level we can have a colour image, perhaps black and white, with each colour being represented by either a or 0.

For more detailed images such as photographs, over 16 million colours can be made available by 256 shades of red, blue and green.

The amount of colours available to use in an image is called the ‘colour ’.The file of a bitmap graphic is directly related to the colour depth and resolution of the image i.e. the number of colours and pixels that are available to use.