Bitmaps #1

Bitmaps #1

by BSN Computing

Multiple Select

In this lesson you will learn to ... ?

• Describe how bitmap images are represented in binary

• Define appropriate terminology

• Construct an expression to calculate the size of an image

• Differentiate between image size and resolution

• Convert between binary data and bitmpa images

Multiple Choice

What does 'binary' mean?

• Having two possible states

• Being composed of 0s and 1s

• A number with 2 possible values

Multiple Choice

What are the possible binary digits?

• 0, 1

• 0,1,2,3,4,5,6,7,8,9

• T, F

• 1, 2

Multiple Choice

How do computers represent ALL information?

• in binary

• in hexadecimal

• in denary

• in octal

Fill in the Blanks

What do you call a single binary value of 0 or 1?

Multiple Choice

Which definition?

The smallest recognisable element of a digital image

• pixel

• resolution

• colour depth

• dot

Multiple Choice

Which definition?

The number of pixels in a digital image or the density of pixels

• pixel

• resolution

• colour depth

• bitmap

Multiple Choice

Which definition?

The number of bits used to store data for every pixel in a digital image

• pixel

• resolution

• colour depth

• metadata

Multiple Choice

Which definition?

Data stored in an image about the image itself

• bitmap

• resolution

• colour depth

• metadata

Multiple Choice

Which definition?

Digital image format that stores data on every pixel

• bitmap

• resolution

• colour depth

• metadata

Multiple Choice

How many colours could be represented in one byte?

• 256

• 512

• 128

• 8

Fill in the Blanks

If a bitmap image can contain up to 1024 different colours of pixel, how many bits are being used to represent each pixel

Multiple Choice

For any bitmap image where n bits are used to store each pixel, how many colours can be represented?

• 2^n

• n^2

• n*n

• n*8

Multiple Choice

Which 'alien' image corresponds to the bitmap shown?

Multiple Choice

Which flag image corresponds to the bitmap shown?

Fill in the Blanks

What is the image size of this image (in pixels)?

Fill in the Blanks

What is the pixel density (ppi) of this image?

Multiple Choice

An image with ____ pixels when displayed with certain dimensions is said to have higher ________ compared to an image containing _____ pixels.

• more

  resolution

  fewer

• fewer

  quality

  more

• smaller

  bit depth

  larger

• more

  compression

  fewer

Open Ended

Thinking Hard

Write down four key words from today's lesson.

Write a single sentence that uses all four key words.

(press Shift+Enter to take a new line ...)

Poll

How much of this lesson have you understood?

• None of it

• Some of it

• Most of it

• All of it