Bitmap and Vector Graphics
Audio
Analogue
Digital
Resolution - how tightly packed the bits are (height * width)
Pixel - Picture element - 1 block of colour(binary number)
File size = height x width x colour depth
Colour depth - how many colours can be represented
Amplitude
CD quality - 44100 Hz
Vector - made up of nodes and paths. They are smoother but less realistic
RBG - 24 bits Transparency - 32 bits
Metadata - hidden data about the image, eg Location, Lens the pic was taken with
Pixelization - zoom image too far then it starts to pixelate
PPI - Pixels per inch
Megapixels - 1 million pixels
.bmp for bitmap images
Bitmap is also a raster graphic
.png - portable network graphic
BITMAP Images
Font uses vectors
They don't pixelate
Set of instructions - draw point a and b and connect with a straight line with a certain thickness and colour
Logos
File Compression - lossy and lossless
Lossy - lose the data when files are compressed
Lossless -image quality forefits
Samples - points plotted for digital wave
Sample rate - number of samples taken in a 1 second interval
CD quality - Bit depth - 16 bits
File size = sample rate(Hz) x bit depth(bits) x duration of recording(s) x channels
Analogue to Digital converter(ADC)
Digital to Analogue converter(DAC)
Nyquist Theorem - twice the band limited frequency
MIDI files - not a recording of live music, just a set of instructions that tell it to synthesize the sound
Eg Modem
Sampling - the process of converting analogue sound waves into digital form to create what is commonly known as digitised or digital sound
Sample interval - the time between samples
Nyquist Theorum - Nyquist’s Theorem is used which faithfully recreates the analogue signal by sampling at least twice the highest frequency
MIDI - a technical standard that’s describes a
protocol, digital interface and connectors. These can be used to connect a variety of instruments, to devices and computers.
A MIDI controller carries event messages that specify pitch and duration of notes, timbre, vibrato and volume changes and allow for the synchronization of devices tempo.
This gives the ability to recreate the music of a much larger ensemble.