1. Bitmapped Images 27 th November 2014 With Mrs Billinghurst @SGS_Computing

2. Bitmapped Images 27 th November 2014 Key Terms: Pixel Bitmap Resolution Colour Depth

3. Bitmapped Images 27 th November 2014 Pixel The smallest area of an image. Each square in this image represents one pixel

4. Bitmapped Images 27 th November 2014 Bitmap A grid of pixels which in which the position of coloured pixels are mapped in a grid.

5. Bitmapped Images 27 th November 2014 Resolution This is the number of pixels that make up an image or screen. width x height

6. Bitmapped Images 27 th November 2014 Colour Depth The number of bits used to represent the colour of a single pixel in a bitmap.

7. Bitmapped Images 27 th November 2014 Colour Depth : 1 Bit (2 colours) White = 0 Black = 1 This image is 32 pixels wide. How many bytes are needed per row? 8 bytes

8. Bitmapped Images 27 th November 2014 Colour Depth : 2 Bit (4 colours) White = 00 Black = 01 Yellow = 10 Green = 11 This image is 32 pixels wide. How many bytes are needed per row? 16 bytes

9. Bitmapped Images 27 th November 2014 Colour Depth : 3 Bit (8 colours) White = 000 Black = 001 Yellow = 010 Green = 011 Brown = 100 Tan = 101 Blue = 110 Light Green = 111

10. Bitmapped Images 27 th November 2014 Also known as monochrome. One bit is allocated to each pixel = black & white 1 Bit Colour

11. Bitmapped Images 27 th November 2014 Each of the RGB components of a colour is given a nibble: 12 Bit Direct Colour

12. Bitmapped Images 27 th November 2014 This simulates the colours that a human eye can see Holding 16.7 million different colours 24 Bit True Colour

13. Bitmapped Images 27 th November 2014 This is really just 24 bit colour with an extra 8 bits. 32 Bit Colour Why? Modern computers work in either 32 or 64 bits (or the additional 8 bits provide transparency)

14. Bitmapped Images 27 th November 2014

15. Bitmapped Images 27 th November 2014

16. Bitmapped Images 27 th November 2014

17. Bitmapped Images 27 th November 2014 Each pixel is stored as a binary number. OR Each pixel is stored as a bit pattern / RGB bits

18. Bitmapped Images 27 th November 2014 8 (or 1 byte) 1286432168421 11111111

19. Bitmapped Images 27 th November 2014 Key Terms: Pixel Bitmap Resolution Colour Depth

20. Bitmapped Images 27 th November 2014 With Mrs Billinghurst @SGS_Computing