![Page 1: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/1.jpg)
![Page 2: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/2.jpg)
Which is the Pink Pen?
![Page 3: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/3.jpg)
Here is the Pink Pen
(Example taken from http://www.colourblindawareness.org)
![Page 4: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/4.jpg)
Light and Colour
![Page 5: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/5.jpg)
The Solar Cell
Converts light into electricityThe stronger the light the more electricity
![Page 6: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/6.jpg)
Measure the Current to Measure the Light Levels
Voltage
Light
![Page 7: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/7.jpg)
Analogue to Digital Conversion
To store three volts we need 2 bits00 = 001 = 110 = 211 = 3
0 3
Light
![Page 8: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/8.jpg)
Analogue v Digital Data
How to represent 10 hours and 15.34567890 minutes?
![Page 9: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/9.jpg)
Quantisation Error
White 15% Grey 30% Grey0 0.3 0.4
White White White0 0 0
Our analogue source gives us
The digital representation becomes
![Page 10: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/10.jpg)
When Applied to an Image
![Page 11: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/11.jpg)
Create an Array of Digital Detectors
![Page 12: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/12.jpg)
Project the Image onto the Array
![Page 13: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/13.jpg)
Using 1 bit per Pixel
![Page 14: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/14.jpg)
Increase the Image Resolution
![Page 15: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/15.jpg)
Increase the Colour Resolution
![Page 16: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/16.jpg)
Colour Resolution and Image ResolutionColour Resolution relates to the depth of
colour the image reproduces. The more bits we use to represent a single pixel the greater the number of colours may be stored in that pixelColour resolution is not related to the size of the
imageWe could have a 1 x 1 pixel image and still have a
colour resolution of 16 million colours – 24 bit colour! (Not that there would be a lot of point.)
Image resolution relates to how many pixels make
up the height and width of the image per inch – dots per inch. Image resolution is an issue when it comes to the
size of the image in dpi
![Page 17: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/17.jpg)
Low Image Resolution Images Don’t Re-Size Well
Both images have high colour resolution
![Page 18: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/18.jpg)
Colour Representation - RGB
Combine Red Green and BlueAlso referred to as 24 bit colourVery common in computing
Black rgb(0,0,0)Red rgb(255,0,0)Green rgb(0,255,0)Blue rgb(0,0,255)Yellow rgb(255,255,0)Cyan rgb(0,255,255)Magenta rgb(255,0,255)Grey rgb(192,192,192)White rgb(255,255,255)
![Page 19: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/19.jpg)
CMYK (Cyan, Magenta, Yellow & Black)
Subtract RGB by mixing Cyan Magenta Yellow and BlackCommon in printing industry and computer printers
![Page 20: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/20.jpg)
The Scanner
![Page 21: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/21.jpg)
InterpolationHow can a 600dpi scanner scan at 1200 dpi?
Without Interpolation With Interpolation
![Page 22: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/22.jpg)
Digital to Analogue ConversionThe Display Adapter / Monitor – Device Resolution
In the case of a monitor, the quality of the equipment is called the dot pitch.
The dot pitch is the distance in millimetres of dots of the same colour.
In the case of a typical monitor the dot pitch is .28, meaning there is .28 mm between the red dots (green dots or blue dots).
The smaller the dot pitch, the higher the quality of the equipment.
![Page 23: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/23.jpg)
The Output from the Graphics CardImagine we scanned in an A4 document at a
resolution of 600 dpi.Displayed on a monitor with a 72dpi graphics
adaptor
![Page 24: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/24.jpg)
Very Common in Student Work
More important when we design for mobile devicesDesign for liquid layout
![Page 25: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/25.jpg)
Displays with Lower Colour ResolutionQ. “How do I view a 16 million colour image
256 colour display?”A. Dithering
A is the original unchanged image B is 1 bit monochrome with dithering C is 1 bit monochrome without dithering
– note the loss of detail D is 8 bit colour with dithering
– note the speckled effect which is common to this process
![Page 26: Which is the Pink Pen? Here is the Pink Pen (Example taken from )](https://reader036.vdocuments.net/reader036/viewer/2022062321/56649f175503460f94c2ebdf/html5/thumbnails/26.jpg)
Gamma CorrectionImages do not display the same across
different hardware platforms
Becomes