2/03/17

Colour & Cameras

Animals

Horses & cows – see in black and white

Monkeys

Evolution – Herbivore – see in green

Humans – see in colour

Cones in our eyes receive in red but its actually green with some yellow.

Diurnal

Pigment

Opsin Apoprotein

It picks up short, medium and long wavelengths.- RGB (Red, Green, Blue)

Camera Sensor 

CCD’s  – Charge Couple Device

  • This is a ‘chip’ in the camera

It used to be 3 CCD’s – One for each colour of RGB. This is a component signal.

Anamorphic  – The image is scaled *squashed in* (Change in X & Y axis) – 4:3 (HD – 1080 X 1920)

CMOS has a DSLR

Silicon wafer is sensitive to light – Photolithography

Creation of very small circuits

Photons will actually create a well when it hits it. The well is known as a pixel which creates a charge output.

Analogue device – Mosaic of filters over the silicon of which there’s twice as many green to one red and one blue.

These pixels can either be red or green or blue.

Images 3x mostly red, green, blue

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CMOS – Larger pixels and size of the area

DSLR – Dynamic range and the noise

Dynamic Range – Colour (wavelengths)

The larger a pixel, the more light it can collect.

The sensor itself, because of charge, creates noise.

Want a cleaner image.

Low f number – low light but larger aperture.

Noise reduction technology.

Larger pixels contain more light. This means the pixel is unlikely to become full so the pixel will be able to receive more tonal values.

More tonal value for RBG: (darker)

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Showreel

Brainstorm -teaser – location, f shutter (ISO)

I am recording a video teaser for my documentary and interview for Teen Wolf. The primary colours would be mainly black and white because it is filmed mostly at night. The ISO would be high because it is filmed mainly in the dark. The interview will be asking people questions about Teen Wolf and things and some would have seen the programmes and some wouldn’t but then you would hear a wolf growling quietly and by the end it gets louder and cuts to black.  The aperture would be small because it is filmed with little light. The shutter speed would be fast.

DSLR Sensor

35mm

CMOS – Charge – Digital signal (Ones and Zeros)

DSLR sensor is 36 x 24mm in Canon 5D.

Full frame.

A- Mosaic – Bayer GRBG

B – Anti alias filter – (maintains sharpness)

C – Infrared sensitive ‘hot mirror’

D – Circuitry

  • The filter to prevent the infrared from entering the camera.

E – Pixel = Photodetect – Capturing photons that releases electrons from silicon and the electricity forms a charge.

F – Micro lenses funnel the light to the pixel avoiding circuitry.

G – Black pixels make a rough estimate as to the amount of noise and subtracts from all colour pixels. So therefore, we have a cleaner image.

 

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