Define Bit
basic unit of data
how many bites in a byte
8
how many bytes in a kilobyte
1000 bytes
how many kilobytes in a megabyte
1000 KBs
how many kilobytes in a gigabyte
1000 KBs
how many gigabytes in a terabyte
1000 GBs
how much storage in a HDD
1-4TB
how much storage in a RAM
8-32GB
how much storage in a SSD
512gb - 1TB
how much storage in a CD
700MB
how much storage in a DVD
4.7GB
how much storage in a BluRay
25GB
What are the 3 methods of reducing file sizes
Compression
Resampling (images)
Cropping (images)
Define Compression & 3 advantages
Reducing the file size of your data
-Save disk space on your device
-Faster to upload to internet for use on website. Others can -then download it faster.
-Faster to transfer data (to servers, HDDs, USB drives etc)
list the 2 types of compression
Lossy & Lossless
define lossy & list 2 examples
Reduces a file size by permanently eliminating certain information. When compression is complete, only a part of the original information is still there. This information cannot be recovered.
-JPEG is an image lossy format
- MP3 is an audio lossy
define lossless compression & list 2 examples
When a file size is reduced without sacrificing any significant information.
-PNG is an image format that provides lossless compression.
- Wav is a lossless audio format
Name 2 other techniques of reducing file sizes
-Resampling
- Cropping
Define Resampling
is the technique used to create a new version of the image with a different width and/or height in pixels.
Define cropping
It simplymeansyou have cropped (removed) a portion of the image but not resized it
Best file format for images online
What colour mode is online images going to be
RGB
What colour mode is print images going to be
CMYK
how much DPI for online images
72 dpi