Skip to content

09Dec.md

Latest commit

 

History

History
33 lines (27 loc) · 1.48 KB

09Dec.md

File metadata and controls

33 lines (27 loc) · 1.48 KB

ICT Lesson, December 9 Notes

1. Imaging

  • What is Video quality? (1080p 720p etc) - p isn't only used for videos btw - 720p is classified as HD - 1080p is classified as HD on YouTube - 1080p = Video that consists Images of 1920x1080 - 1080i = Used when TVs only had 50Hz refresh rate - Generate half an image per scan, to trick our brain that we're seeing the full image - 25fps - 2K = 2560x1440 - 4K = 3840x2160 - 8K = 7680x4320 - Keep in mind that as the resolution increases, the size of the file will increase too

2. Image Compression

  • What if my tablet has a 2K monitor but the source only has 1080p? - oh no! Compression will be involved. - Compression is divided into 2 kinds, lossy and loseless conversion. - Lossy conversion = Displays the colors close enough to be useful - Not a lot of detail can be seen as it only combines similar colors - Loseless conversion = Displays all colors truly - Will have a lot of detail as it isn't combining similar colors

P.S. : Citation on lossy

  • The term is (widely?) used in Java
  • Lossy conversion = Convert a data type (e.g. int) to another data type (e.g. float) - It will be "close enough" to original dataset but will have it's own differences.

Source: Google