1. photographic processes for digital and film capture
2. Eight layers of color film
3. Five layers of a CCD
4. Differences between a CCD and CMOS Sensor
5. Two benefits of using the Camera Raw Format
Film vs. Digital
There have been significant improvements in actuators, and lenses
Difference is how light is trapped and preserved
Film reaction between light and chemicals
protective layer
UV filter
blue light layer
yellow light layer
green light layer
red light layer
adhesive layer
film base
a sheet of plastic
(polyester, PET, cellulose acetate)
Light -> protective coating, emulsion, adhesive, base, adhesive
Digital: Converting light to data
CCD: Charge-coupled device, a device for converting electrical charge, into a digital value
Pixels are represented by capacitors, which convert and store incoming photo as electron charges
Willard Boyle and George E. Smith, 1969
Digital: converting right to data
micro lens:capture the light and direct it towards light-sensitive areas
Hot mirror: lets visible light pass, but reflects light in the invisible part of the spectrum
Color filter: photodiodes are color bihind. a color filter matrix separates the light into red, green, blue. usually referred to as bayer array
Photodiodes: this is where light energy is converted to electrons, creating a negative charge
Well(depletion layer): where the electrons are collected
Bayer filter on a sensor
blue, two green, red
incoming light -> filter layer -> sensor array
RGB color plane
A 4*4 subset
R G0 G1 B
Actual sensor Information with Bayer Filter
CCD vs CMOS Sensors
CMOS: Complementary metal oxide semiconductor
Camera Raw File Format
-contain minimally processed data from the sensor
-image encoded in a device-dependent color space
-Captures radiometric characteristics of the scene
