Y8 - Data Representation - Quiz 8

What is a bitmapped image made up of?

• Pages

• Parts

• Pixels

• Petabytes

Which of these statements about pixels is not correct?

• The smallest element of a bitmapped image

• Represents a single colour

• Stores a binary number

• Short for Picture Eliminator

Which of these statements about colour depth is not correct?

• Represents the number of bits per pixel

• It determines the numbers of colours that each pixel could display

• To display more colours the colour depth needs to be reduced

• Describes the amount of data that is stored in each pixel

A bitmapped image uses a colour depth of 3-bits and this allows for 8 different colours. If the number of different colours that need to be represented increases to 30, what is the minimum new colour depth required?

• 4

• 5

• 6

• 7

Which of these statements about image resolution is not correct?

• Refers to the clarity of an image

• Describes the size of a bitmapped image in pixels

• Can be improved by reducing the number of pixels

• Can be calculated by multiplying the width in pixels by the height in pixels

A bitmapped image is 10 pixels wide and 15 pixels high. What would be the image resolution of this image?

• 100 pixels

• 115 pixels

• 105 pixels

• 150 pixels

Which two of these would be correct if a bitmapped images resolution was increased from 100 pixels to 1000 pixels?

• File size increases

• File size decreases

• Quality increases

• Quality decreases

Which two of these would be correct if a bitmapped images colour depth was decreased from 8 bits to 3 bits?

• File size increases

• File size decreases

• Quality increases

• Quality decreases

To calculate the file size in bits for a bitmapped image, which formula needs to be used? Note: * means multiply / means divide

• File size in bits = height in pixels * width in pixels / colour depth in bits

• File size in bits = height in pixels / width in pixels * colour depth in bits

• File size in bits = height in pixels * width in pixels * colour depth in bits

• File size in bits = height in pixel / width in pixels / colour depth in bits

What is the file size for a bitmapped image that is 20 pixels high, 20 pixels wide and uses a 4 bit colour depth?

• 400 bits

• 160 bits

• 1600 bits

• 4000 bits