Reducing Image Memory Consumption in 10 Minutes
summary
Shows how to replace full decoded image buffers with smaller decoded thumbnails using Image I/O thumbnail creation and downsampling, turning a 266 KB JPEG into a 17×80 image buffer that costs ~13.4 MB in RAM and cutting app resident memory from ~69.5 MB to ~56.3 MB (about 13.2 MB saved) per image. Uses UIImage/UIImageView pipeline, CGImageSourceCreateThumbnailAtIndex options, and recommends serial background decoding to avoid thread explosion.
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chapters (19)
- 0:00Intro
- 0:30Outline
- 1:15Example
- 1:43iPhone App
- 2:26Buffers
- 3:08Image Buffer
- 3:31Frame Buffer
- 3:58Frame Buffer Changes
- 4:49A Holistic View
- 5:04Decoding
- 6:45Image Dimensions
- 7:48How to Get a Smaller Image Buffer
- 8:00Image IO
- 8:31Rendering Pipeline
- 8:45Code
- 10:27Sample App
- 10:54When to use
- 11:29Further resources
- 11:42Twitter
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