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Representing data - images
Representing data - images
Draw an 8x8 image
Let's try that again!
Draw an 8x8 image!
Click on the next tab to see your image
What happened to your image?
Click the tab at the bottom of the spreadsheet and complete the task again, this time using the 16x16 grid.
Has the quality improved?
- A typical screen size is 1280 by 800
- That's1,024,000 pixels to cover the whole screen.
- The higher concentration of pixels the better the resolution
What do you think happens to the file size when we use more pixels?
16x 16 uses 4 times the data compared to 8x8!!
Shared area\ICT\Year 7\Computing Unit 1\Lesson 8\Bitmap_images
Bitmaps
CTRL C = Copy
CTRL V = Paste
- Bitmaps are the name given to one way of storing graphics on a computer system.
- A bitmap is laid out in a grid format with each box on the grid containing one “Picture element” which is better known as a “Pixel”.
- It isn't the same quality as the original!
- This is called being pixelated.
- There isn't enough binary data in order to represent our image with smooth lines so it looks 'blocky'.
- resizing images from the internet
- How can we get a better image quality?
Colour Images
Using Colour
Now go to the colour tab and draw a colour image of your own using the numbers 0,1,2 or 3
Learning objectives
Your computer is using 24 bit colour which gives us over 16 million colours!
(The computer wouldn't really understand 2 or 3 - a merit for anyone who can tell me what it would understand!)
- Create an image using binary data.
- Understand that the size of the bitmap affects the size of the file.
- Understand how colour images are created using binary.
Starter activity
So far, our images are in black and white. Black is represented by 1 and white is represented by 0. To use more colours we need to use more bits (bigger binary numbers)
If we use a two digit binary number, how many different colours could use?
Complete the starter activity: Can you remember binary addition and subtraction?
Admin time!
Plenary
You need to print out each of the images created today.
Open up word FIRST, then get your image on the screen and press 'prt scr'. Go into word and then press paste.
Do this for each of your images.
Complete the plenary activity to assess your understanding!