Do it now activity Use the coloured pencils to complete the do it now activity. Stick in your book.

Learning objectives Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency

Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives New Learning Work in pairs; Make a pretty picture with the paper squares like your teacher showed you. Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives New Learning Finished? Now you are going to “package” the picture in bits to send the picture to another team When it gets to them, they need to reassemble it.   Work out a system that allows them to do this.  Write your system/instructions on the package.    Send your “package” with instructions to help them do this This is a little like what happens when a picture is opened on your pc/device. Except the pc or device has more colour choices because we use binary code, which has millions of combinations to choose from. Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Talk Task Did they get it right? What instructions did you give them? Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Talk Task Did they get it right?  What instructions did you give them? Which one worked best?  Why? Send to peers to re assemble. Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Learning Development Image Package Pixel RGB Analogue Digitising Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Learning Development If you look REALLY closely at a digital picture, it looks like this……….just like the picture you coloured in for our do it now task Each square is called a PIXEL.  When you create an image using image manipulation software like Fireworks or Photoshop you use a different number of pixels for different tasks - 72 ppi (pixels per inch) for images that will be viewed on the web and 300 ppi for images that will be printed. Each pixel has binary code that tells the device where it belongs in the picture.  Kind of like a grid reference or a cell address.  This *pixel*, could have an address of; Y150, X200  Just like our do it now task each pixel also has code that tells the device what colour it is.  Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Learning development Each pixel code that tells us what colour it is; is made up of a mix of red, green and blue and there are over 16 million colour combinations!    See for yourself!  http://www.colorpicker.com/ So each pixel has information telling you where it goes and what colour it is. Remember this information is all stored using binary. Back to task 1, how did you know how to put your class mates’ image together? A device needs this information too. What sort of information do you think a device needs to show an image properly? Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Learning development METADATA Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Learning development This information that is used to tell the computer how to put an image together is called METADATA   Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Independent Task Go back to our Weebly page Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Independent Task Go back to our Weebly page Download and save the Lesson 3 Activities worksheet Complete Task 1 and stick in your book Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Independent Task How did the second method “compress” the image? Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Independent Task How did the second method “compress” the image?    Is Lossy better? Why?   Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Independent Task Try out task 2 Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Independent Task Try out task 2 Look at Grumpy cat. Resize grumpy cat to be really small then go to picture tools, compress pictures. Now make it big again…. What happens? Why?   Images such as JPEG and GIF in some applications (e.g.fireworks) will automatically compress the images to save on memory. Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Independent Task Level 5: Explain how images are stored on a computer using binary. Use keywords. Level 6: How would you explain what Metadata is to someone who has not done task 1? Level 7: How can compression be used to help a program run more efficiently – think in terms of the images included in the program    In your books answer the following questions: Image Package Pixel RGB Analogue Digitising Pixelated Binary

Plenary 2 stars and a wish. What have you learned? Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives Plenary 2 stars and a wish.  What have you learned? What would you like to know more about? Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata

ALL MOST SOME Image Package Pixel RGB Analogue Digitising Pixelated Recognise how images are stored in a computer system Investigate how computers use metadata to display images Investigate how compression can be used to increase efficiency Learning objectives ALL (Level 5) Understand how data, such as numbers, sound and images are physically stored on a computer system. Explain how images are stored on a computer using binary. MOST (Level 6) Understand how instructions are run inside a computer How would you explain what Metadata is to someone who has not done task 1 SOME (Level 7) Understand how instructions can be written efficiently and be able to describe the efficiency of your programs How can compression be used to help a program run more efficiently Image Package Pixel RGB Analogue Digitising Pixelated Binary Metadata