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SMART Activity

• WRITE the number 37 in Binary using the following columns in BINARY to help:

EXERCISE BOOK STANDARDS - class code: CW, Date, Title: Images in Binary.

128 64 32 16 8 4 2 1

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Introduction to Computer Science – Images in Binary

Understand how binary can be used to represent images

Be able to represent your own images using binary

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Activation• ALL files in a computer are comprised of

binary effectively so that the computer can read and understand their content.

• We have looked at how binary works in the previous lesson by representing different number in binary.

• Today you will look at a range of concepts related to binary and the use of images.

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Activation cont…

• Look at the following key terms related to images:• PIXEL

• RESOLUTION

• RGB

• BINARY

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Activation cont…

PIXEL

• The term PIXEL means PICTURE (PIX) ELEMENT (EL).

• It is a combination of Red, Green and Blue (RGB) values on screen to represent a colour using a mixture of the 3.

• Depending on how many PIXELS are used an image can have more or less information to show the image itself.

• When you look at a computer screen closely you can see the different PIXELS used.

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Activation cont…

RESOLUTION

• The term RESOLUTION refers to the TOTAL number of PIXELS used to represent an image.

• RESOLUTION is read by 2 numbers, width and height.

• 1920 x 1080 means 1920 pixels across by 1080 pixels down.

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Activation cont…

BINARY

• We used BINARY to represent the RGB COLOUR value used in each PIXEL.

• The COLOUR RANGE is based on the NUMBER of BITS (binary) allowed in each PIXEL.

• So a 1 BIT image can have 2 different colours, BLACK or WHITE. Where there is a ZERO it is WHITE, where there is a ONE it is BLACK.

• LOOK at the image on the following slide.

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Activation cont…

BITMAP

• On the LEFT you can see the BINARY REPRESENTATION of the IMAGE. On the RIGHT you can see what the IMAGE should look like.

BITMAP IMAGE REPRESNTATION

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Activation cont…

BITMAP

• If you ASSIGN more BITS to a SINGLE PIXEL you can get more COMBINATIONS of COLOUR.

• A 2 BIT (0's or 1's) will give a colour range of 4 different colours.

BITMAP IMAGE REPRESNTATION

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Demonstration Task 1CREATE a 1 BIT BLACK and WHITE image with a RESOLUTION of 5 x 5.

WRITE the image as a BITMAP and SHOW the IMAGE REPRESENTATION.

• Write your working out. In your exercise book.

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Demonstration Task 1CREATE a 1 BIT COLOUR image with a RESOLUTION of 10 x 10.

WRITE the image as a BITMAP and SHOW the IMAGE REPRESENTATION.

• Write your working out. In your exercise book.

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Consolidation

• Go to www.mrbainbridge.co.uk and complete th test under:

COVID-19 COVER WORK > COVID-19 YEAR 7> Lesson 11 Images in Binary