The Glitching Hour
summary
Covers Bitmap and JPEG specifics: how JPEG uses the DCT, quantization matrices, and chroma subsampling so photos can shrink to 1/10 the original file size with little perceptible change. Shows pixel-level glitches for BMPs and byte-level corruption for JPEGs (scan for the FF DA marker and flip a random byte), and demos working code and online tools at sailor HT com slash glitchy. Demonstrates that a single corrupted byte can change color, shift block position, or produce browser-dependent propagation differences (Chrome vs Safari).
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chapters (12)
- 0:00Introduction
- 3:46Compression
- 7:42Discrete cosine transform
- 13:40Basis functions
- 15:12Quantization Matrix
- 15:57Larger Images
- 16:30Artifacting
- 17:19Data Corruption
- 18:18Correct Data
- 19:47JPEG Data
- 20:11Chrome
- 21:40Outro
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