86: One Format to Rule Them All

iOhYes

Tweet Shoutouts

@iOhYesPodcast Sorry, I lied last week. As a dev & listener I like longer podcasts & rants b/c I learn so much! btw, first name -> Frank

— BaraLabs, LLC (@BaraLabs) September 23, 2015

@jazzychad @iOhYesPodcast sounds like you wanted to embed a tableViewController in your tvOS storyboard, give that a try

— Ashton Williams (@AshtonDev) September 23, 2015

@jazzychad @iOhYesPodcast it’s the road to awesome! Let’s you adjust the frame (of the whole tvc) and still use static cells

— Ashton Williams (@AshtonDev) September 23, 2015

@jazzychad @iOhYesPodcast about overscan, you still want an edge to edge UI just make sure content in within. Insets and custom views/cells

— Ashton Williams (@AshtonDev) September 23, 2015

@iOhYesPodcast my handle is pronounced “mo+ka+jo” ?? That’s due to the italian way of say “gio” that sounds like “jo”

— You can call me Joe (@mokagio) September 23, 2015

Yeah, you can disable lowercase letters on iOS 9 keyboard. Thanks for the tip @iOhYesPodcast

— Marián ?erný (@mariancerny) September 24, 2015

@iOhYesPodcast Late listener but about extensions: they are only syntactic sugar for external functions operating on a type, so it's ok :)

— PorstUndGargel (@PorstUndGargel) September 27, 2015

Discussion

• Live Photos - Combo of JPEG and MOV
  • JPEG
    • around 2.5 MB
    • 12 MP
    • 95% quality
  • MOV
    • around 2 MB
    • 720p
    • 12 FPS (up to 15 FPS?)
    • 1.5 secs before and after JPG
    • h.264 encoded
• Formats
  • Bitmap
    • Decoded in memory representation
    • 4 bytes per pixel (even when no alpha) - on iOS at least
    • 1920x1080 - 8,294,400 bytes (~8MB)
  • Lossless vs Lossy
  • PNG (Portable Network Graphics)
    • lossless (can have alpha)
    • Will be ~3.5MB (naive compression can be poor but tools like PNG Crush can help)
  • JPEG (Joint Photographic Experts Group)
    • lossy (no alpha)
    • ~1.1MB at 95% quality and ~650KB at 85% quality
    • Hardware decoding support
      • How Apple quality vs ImageMagick interpreted quality
        • 0.830 == 95%
        • 0.575 == 85%
        • 0.465 == 75%
        • 0.400 == 65%
  • WebP
    • lossy (no alpha) or lossless (alpha)
    • ~850KB at 95% quality and ~500KB at 85% quality
    • ~2.6MB lossless
    • limited support
  • JPEG–2000
    • lossy (no alpha) or lossless (alpha)
    • over engineered (one format for all use cases) - complex
    • ~800KB at 95% quality and ~650KB at 85% quality
    • limited support
  • Progressive JPEG
    • ~10% smaller than JPEG (~1MB at 95% and ~550KB at 85%)
    • Using ImageIO you can get things to load progressively (iOS 8+ only)
    • Hardware decoding support
    • ~25% to first scan
  • Progressive JPEG–2000
    • Same size as non-progressive
    • 5 different “progressive modes” - again complex
    • Only RPCL and RLCP modes will work with ImageIO on Apple OSes, super fragile too (but it works)
    • ~25% to first full frame
  • PVRTC
  • Other texture graphics
  • SVG (scalable vector graphics)
    • Resolution independent
  • GIF (Graphics Interchange Format)
    • Uses a palette of 256 predefined colors, limiting quality
  • APNG (Animated PNG)
    • Can get very large very fast

Picks

Darryl

• Building Push-Triggered Sync - OmniGroup Dev Blog
  • Part 1 - Building Push-Triggered Sync, Part One: Choosing a Language
  • Part 2 - Building Push-Triggered Sync, Part Two: First Steps
  • Part 3 - Building Push-Triggered Sync, Part III: Connecting to APNs

John

• LiveCoding.tv

Nolan

• LivePhotoDemo
• APNGKit
• SwiftSVG
• ImageMagick
• iOS 9 Adoption Rate
• Twitter Dealing with Unreliable Networks - fixed URL from last week
• Shackleton
• Shackleton Whisky
• Pappy Van Winkle - $1000+ per bottle

Alternative show title suggestions

• Heft of images
• No silver bullets
• I’m lazy
• A billion people on the Internet
• 0 to 255 of transparency
• J-FIF
• Make informed defaults
• (When you) do do WebP
• lawyers, no thank you
• brother’s babies
• The GOVERNMENT!

This episode of iOhYes is brought to you by Braintree. Thanks to Braintree for supporting iOhYes and 5by5. Check them out at braintreepayments.com/yes