Theodor-Springmann-Stiftung/kgpz_web
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size reduction images

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Simon Martens
2025-09-29 23:30:34 +02:00
parent 269d635f1d
commit 9a856527cc
5 changed files with 96 additions and 66 deletions
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scripts/README_IMAGE_COMPRESSION.md
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@@ -30,7 +30,8 @@ pictures/
### Performance Benefits
- **60-80% smaller file sizes** for layout browsing
- **Faster page loads** with compressed images
- **Additional 75% size reduction** from 50% resize for preview images
- **Faster page loads** with compressed and resized images
- **Full quality** maintained for detailed viewing
- **Progressive enhancement** with WebP support detection
@@ -47,12 +48,14 @@ Run the provided script to convert all existing images:
For individual files:
```bash
cwebp -q 75 -m 6 pictures/1771-42-166.jpg -o pictures/1771-42-166-preview.webp
# The script automatically calculates 50% dimensions
cwebp -q 75 -m 6 -resize 1200 800 pictures/1771-42-166.jpg -o pictures/1771-42-166-preview.webp
```
### Quality Settings
- **Quality**: 75% (good balance for text-heavy images)
- **Compression**: Level 6 (maximum compression)
- **Resize**: 50% (reduces file size by ~75% additionally)
- **Format**: WebP (excellent text preservation)
## Browser Support
@@ -72,11 +75,11 @@ cwebp -q 75 -m 6 pictures/1771-42-166.jpg -o pictures/1771-42-166-preview.webp
Typical compression results for newspaper images:
| Image Type | Original JPEG | WebP Preview | Savings |
|------------|---------------|--------------|---------|
| Text page | 800 KB | 320 KB | 60% |
| Mixed page | 1.2 MB | 480 KB | 60% |
| Image page | 1.5 MB | 750 KB | 50% |
| Image Type | Original JPEG | WebP Preview (50% + compression) | Total Savings |
|------------|---------------|----------------------------------|---------------|
| Text page | 800 KB | 80 KB | 90% |
| Mixed page | 1.2 MB | 120 KB | 90% |
| Image page | 1.5 MB | 190 KB | 87% |
## Development Notes