Images And Compression Flashcards
Name 4 types of image format
• BMP
• JPG
• GIF
• PNG
Def resolution
The concentration of pixels within a given area
What is included in the metadata of an image?
• Colour depth in bits per pixel
• Resolution (Height and width in pixels)
• Date created
• Author
How is audio changed between analogue and digital?
A-D is an analogue digital converter
D-A is a digital to audio converter
What is the sample rate and what is its unit?
The amount of samples taken every second measured in hertz
What is the bit depth in an audio sample
The resolution
How does the frequency of sample rate affect an audio file?
It increases the file size and increases sound quality
What is the equation for a sound file size?
File size = sample rate x bit depth x duration
What is lossy compression? And an example?
Lossy compression removes sounds that we can’t easily hear or that least affect the perceived playback quality. MP3
Examples of lossless audio compression software?
• FLAC (Free Lossless Audio Codec)
• ALAC (Apple Lossless Audio Codec)
• WMALossless (Windows Media Audio)
What are 2 examples of uncompressed audio formats?
WAV
AIF
Name 2 lossy audio file formats
• MP3 (MPEG-1 Audio Layer III)
• AAC (Advanced Audio Coding) – typically higher quality
than MP3
Lossy compression examples?
JPG, GIF, MP3
Lossless compression examples?
PNG, TIFF
Benefits of compression?
Less internet traffic
Quicker transmission of packets
