Lossless vs Lossy Compression for Web Images: Choosing Wisely
Understand the engineering trade-offs between lossless (PNG, WebP) and lossy (JPEG, HEIC) image compression for web applications.
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Compression algorithms shrink image file size using two fundamentally different methodologies.
Lossless Compression
Preserves 100% of original pixel data without discarding any information. Used by PNG, GIF, and lossless WebP. Essential for screenshots, logos with sharp typography, and vector icons where blurry artifacting is unacceptable.
Lossy Compression
Discards imperceptible color nuances based on human psycho-visual perception. Used by JPEG, HEIC, and lossy WebP. Can reduce photo file sizes by 80% to 90% with virtually zero perceptible loss of visual quality.
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