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ICT Lesson, 15 December notes

1. Videos

  • Made up of audio (soundtrack) and a lot of images

  • FPS / Frames Per Second

    • How many pictures are there per second?
    • 60 / 90 / 120 / 144 / More (varies)
    • The higher the FPS / Frame rate, the more stuff animations "seem" to be
    • P.S: Humans can sometimes read up to 1000FPS
      • More than 1000FPS = 1000FPS because we can't even see all the frames

  • Resolution / Frame Size

    • Same as picture

  • Color Depth

    • The number of bits used to indicate the color of a single pixel
    • Usually 10 / 12 / 24 bits

  • Compression ratio on audio

  • Compression (same with Images)

      1. Lossy
      • Combine similar colors into one color
      • Smaller file size but lower quality in return
      1. Loseless
      • No dirty hack, save whatever is recorded
      • Large in file size

2. Image file types

  • BMP (bitmap image file)
    • No compression is involved
    • Largest in file size
  • JPG
    • A lot of compression
    • Smallest in file size
  • PNG
    • Not that much of compression
    • Smaller in file size, compared to BMP
  • GIF
    • A bunch of photos (like animation)
    • File size varies
  • TIFF (Tag Image File Format)
    • No compression is involved
    • Usually used by scanners
    • Preferred by photographers, digital artists, etc.
  • RAW
    • No compression is involved
    • Usually used by scanners again
    • Extremely uncommon
    • Normal image viewers / editors can't view / edit them