colourcolour dr d adriaens what do we (not) see? which / how many colours do we see?...many. a...
Post on 21-Dec-2015
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COLOURDr D Adriaens
What do we (not) see?
Which / how many colours do we see?
...many. A computer nowadays ‘sees’ over 16 million colours. The exact number?16,777,216 (for 24-bits images); up to 281,474,976,710,656 (for 48-bits images).A human eye can see about 10,000,000 different colours (of course, when you’renot colour blind...)
...and which / how many don’t we see?
Let’s find out!!!
Red, Orange, Yellow, Green, Blue, Violet, ..., Jade, White, Black, Brown, Pink,Alizarin, Lavender, Amber, Maroon, Aquamarine, Beige, Turquoise, ...
Metals: two (simultaneous) experiments...
Iron (Fe) can be different colours:•Silvery grey: iron metal (Fe0)•Green-yellow: iron oxalate (Fe2+)•Brown-red: blood cells, rust (Fe3+)•Blue: iron oxide (Fe2+ and Fe3+)Can we change the colour in a simple experiment?
Metals: two (simultaneous) experiments...
Copper (Cu) can be different colours:•Bronze: copper metal•Black: copper oxide•Red: copper oxide (again)•Green: copper carbonate•Blue: copper sulphateCan we change the colour in a simple experiment?
Metals: two (simultaneous) experiments...
COPPER• Bronze• Black• Red• Green• Blue
IRON• Silvery grey• Green-yellow• Brown-red• Blue
Iron Oxalate
xxxxxxxxxxxxxxxxxx
www.acdlabs.com: Chemsketch
Fe(COO)2 2 CO2 Fe
Copper Oxide
www.acdlabs.com: Chemsketch
CuO or Cu2O CuSO4 H2 + ...
Copper Carbonate
www.acdlabs.com: Chemsketch
Imagine CuCO3 as CuO and CO2...
COLOURS
Red-GreenBlue-YellowBlack-White
Red: 700-635Orange: 635-590Yellow: 590-560Green: 560-490
Blue: 490-450Violet: 450-400
The webcam: an experiment...A webcam changes colours......into an electrical signal.
Focusing lens – focuses the light to a smaller beam
Filter – removes unwanted light
CCD – captures light and changes it into electricity
USB cable – to computer
The webcam: an experiment...
The computer screen or the projector......changes this back into colour.
What if somethinggoes wrong??
A webcam changes colours......into an electrical signal.
The webcam: an experiment...
Focusing lens – focuses the light to a smaller beam
Filter – removes unwanted light
CCD – captures light and changes it into electricity
USB cable – to computer
The filter doesn’t work properly...
COLOURS
Red: 700-635Orange: 635-590Yellow: 590-560Green: 560-490
Blue: 490-450Violet: 450-400
Infrared: > 700
Ultraviolet: < 400
Now... How can we use it?
