画像圧縮
画像圧縮ガイド
ImageCompression
Image Compression Guide
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Optimize image compression settings to balance file size and quality for different uses.
Características Principales
JPEG quality slider impact on file size and quality
PNG lossless compression for graphics
WebP modern format advantages
Metadata removal for smaller files
Batch compression tools and automation
Compression calculator for estimated file sizes
How to Use Image Compression
Select Format
Choose appropriate format: JPEG for photos, PNG for graphics with transparency, WebP for web
Set Quality Level
Use JPEG quality slider (1-100) where 80-90 balances quality and file size
Remove Metadata
Strip unnecessary EXIF data to reduce file size further
Preview Result
Compare original and compressed versions to verify quality
Optimize Dimensions
Resize to actual needed dimensions before compression
Export and Test
Save and test compressed file in actual use context
Casos de Uso
Web image optimization for faster page loading
Email preparation reducing attachment file sizes
Cloud storage and backup managing space efficiently
Social media preparation with platform-specific requirements
Preguntas Frecuentes
What JPEG quality should I use?
80-85% quality provides excellent results with significant file reduction. 90%+ retains most detail but increases size.
When should I use PNG?
Use PNG for graphics, screenshots, and images requiring transparency. File sizes are larger but lossless.
What is WebP and why use it?
WebP offers superior compression versus JPEG while maintaining quality. Modern browsers support it; older browsers may need fallbacks.
Should I remove all metadata?
For privacy and size, yes. But preserve copyright/attribution if important. Remove location data if privacy-sensitive.
Can compressed images be restored to original quality?
JPEG compression is lossy; quality cannot be recovered. Always keep original files. PNG and WebP can preserve quality.