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Principles of Digital Photography 1 (Quality Issues (Bit Depth (Number of…
Principles of Digital Photography 1
Image Sensor
Transported to ADC
Between the image sensor and storage device
Analogue to Digital Converter
Converted to digital signal
Electrical Charge
Signals
Analogue
Continuously variable
Range of data points
Continuous, fluctuating line
Represented by points on a curve
Digital
Digitised analogue signal
Digital file created
Signals converted to series of 0s and 1s
Quality Issues
Bit Depth
Number of binary digits (bits)
How much colour info is available to print / display each pixel in an image
Lenses
Sensor size / type
Aspect Ratio
Operator
Resolution
Pixels per inch
Horizontal x Vertical
File Formats
Lossless
File format
RAW
TIFF
Advantages
Compress and uncompress
No loss of information
Disadvantages
More storage required
Requires software to process image
Loosy
File format
JPEG
Advantages
Less storage space
Disadvantages
Loses information
Image quality reduced
Compressed
Open and resave - progressive loss of quality
Interpolation
Using a range of known data points
Nearest neighbour duplicates the colour of the closest pixel
Construction of new data points
Dynamic Range
Difference between
Detected by sensor
Recorded in a single image
Brightest and darkest value