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Transcript

  • 1. Sounds and Images
  • 2. Starter Activity: ASCII Art Go to: http://www.glassgiant.com/ascii/ Convert a picture of your choose to ASCII text art - a jumble of letters, numbers and symbols that do not appear to have any significance until you step back and look at the whole picture. Sounds and Images
  • 3. In this lesson you will learn about how computers create sounds and images. You converting binary numbers into images, explore how colours are created and how a computer produces sound. Lesson Objectives  Understand how a computer creates images  Be able to convert binary into an image and visa versa  Understand how different colours are created  Understand how a computer produces sounds Sounds and Images
  • 4. Images •A computer monitor is made up of lots of dots called pixels arranged in rows and columns •Each pixel displays some combination of red, green or blue Sounds and Images
  • 5. Binary to Pixels The interface between you computer and monitor translates binary-coded information into the colour combinations that make up an image. Sounds and Images
  • 6. Task 5: Binary to Image Conversion Click on the link named ‘Binary to Image’ which is in the Getting Technical folder in Groupwork. Click on the squares with a “1” in them to turn them on. Be ready for a small surprise! Sounds and Images
  • 7. Task 6: Image to Binary Conversion Open the file named ‘Image to Binary’ which is in the Getting Technical folder in Groupwork. Create two (black and white) images as shown in the example below and then convert each image into binary. Sounds and Images
  • 8. Colour Depth/Bit Depth The more bits per pixel the greater combination of binary numbers and therefore colours. Sounds and Images 8 bit 2 bit 1 bit
  • 9. Task 7: Bit Depth Open the image named ‘Mr Winrow’ in Serif DrawPlus. It is saved in the Getting Technical folder in Groupwork. 1.Click on File > Export > Export as Image 2.Change the Format from JPG to BMP 3.Check out what the image would look like if you exported it with different Bit Depths 4.Notice how when the image quality/bit depth is reduce the file size of the image also reduces Sounds and Images
  • 10. Colours as Numbers •Colours are made by mixing red, green and blue •If 8 bit numbers are used values can range from 0 – 255 for each of the colours •Black would be represented by (R=0, G=0, B=0) •Red (255, 0, 0), Green (0, 255, 0), Blue (0, 0, 255) •A pale yellow colour would be (200, 180, 120) •Colours on the Internet can also be represented in hexadecimal codes – Remember #000000 Sounds and Images
  • 11. Sounds Analogue information that we can hear cannot be understood by a computer it needs to be converted into digital information. Sounds and Images
  • 12. Sounds Cards Sound cards convert digital information (binary) to analogue sounds that we can hear. If a microphone is plugged into a sound card they can also convert analogue sounds to digital information. Sounds and Images
  • 13. Sounds Cards The more information that is recorded about each point in a sound or music track the better quality the recording will be. Sounds and Images
  • 14. Task 8: Sound Quality Listen carefully to the next 4 sound tracks. Arrange them in order from the worst to the best quality. Sounds and Images Track Number Sound Quality Worst Best
  • 15. Task 8: Sound Quality - Answers Listen carefully to the next 4 sound tracks. Arrange them in order from the worst to the best quality. Sounds and Images Track Number Sound Quality Task D Task A Task B Task C Worst Best
  • 16. Plenary: 5 Key Points Note down five key points which summarise what you have learnt in today’s lesson. Be ready to share your points with the rest of the class. Sounds and Images
  • 17. Keywords  Understand how a computer creates images  Be able to convert binary into an image and visa versa  Understand how different colours are created  Understand how a computer produces sounds Objectives  Pixels  Monitor  Binary  Bits  Colour Depth  Hexadecimal  Analogue  Modem     Sounds and Images