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Bitmapped Images
27th November 2014
With Mrs Billinghurst
@SGS_Computing
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Bitmapped Images27th November 2014
Key Terms:PixelBitmapResolutionColour Depth
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Bitmapped Images27th November 2014
PixelThe smallest area of an image.
Each square in this image represents one pixel
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Bitmapped Images27th November 2014
BitmapA grid of pixels which in which the position of coloured pixels are mapped in a grid.
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Bitmapped Images27th November 2014
ResolutionThis is the number of pixels that make up an image or screen.
width x height
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Bitmapped Images27th November 2014
Colour Depth
The number of bits used to represent the colour of a single pixel in a bitmap.
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Bitmapped Images27th November 2014
Colour Depth : 1 Bit (2 colours)
White = 0Black = 1
This image is 32 pixels wide.How many bytes are needed per row? 8 bytes
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Bitmapped Images27th November 2014
Colour Depth : 2 Bit (4 colours)
White = 00Black = 01
Yellow = 10Green = 11
This image is 32 pixels wide.How many bytes are needed per row? 16 bytes
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Bitmapped Images27th November 2014
Colour Depth : 3 Bit (8 colours)
White = 000Black = 001
Yellow = 010Green = 011Brown = 100
Tan = 101Blue = 110
Light Green = 111
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Bitmapped Images27th November 2014
Also known as monochrome.
One bit is allocated to each pixel = black & white
1 Bit Colour
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Bitmapped Images27th November 2014
Each of the RGB components of a colour is given a nibble:
12 Bit Direct Colour
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Bitmapped Images27th November 2014
This simulates the colours that a human eye can see
Holding 16.7 million different colours
24 Bit True Colour
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Bitmapped Images27th 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)
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Bitmapped Images27th November 2014
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Bitmapped Images27th November 2014
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Bitmapped Images27th November 2014
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Bitmapped Images27th November 2014
Each pixel is stored as a binary number.
OR
Each pixel is stored as a bit pattern / RGB bits
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Bitmapped Images27th November 2014
8(or 1 byte)128 64 32 16 8 4 2 1
1 1 1 1 1 1 1 1
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Bitmapped Images27th November 2014
Key Terms:PixelBitmapResolutionColour Depth
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Bitmapped Images
27th November 2014
With Mrs Billinghurst
@SGS_Computing