Lossless Compression
Lossless Compression (Reversible Data Reduction)
Lossless compression reduces file size without discarding any image data. The original image can be perfectly reconstructed from the compressed file. PNG, TIFF (with LZW), and WebP lossless use this approach.
ๆๆฏ็ป่
Lossless algorithms exploit statistical redundancy: PNG uses DEFLATE (LZ77 + Huffman coding) with row-level prediction filters. Typical compression ratios range from 2:1 to 10:1 depending on image complexity.
็คบไพ
```javascript
// Image compression via Canvas
canvas.toBlob(
blob => console.log(`Size: ${(blob.size/1024).toFixed(0)} KB`),
'image/jpeg',
0.8 // quality: 0.0 (smallest) to 1.0 (best)
);
// WebP output (25-34% smaller than JPEG)
canvas.toBlob(cb, 'image/webp', 0.8);
```
็ธๅ ณๆ ผๅผ
็ธๅ ณๅทฅๅ ท
ๅ
ๅ็ผฉๅพ็
่ฐ
่ฐๆดๅพ็ๅคงๅฐ
่ฃ
่ฃๅชๅพ็
ๆ
ๆ่ฝฌๅพ็
็ฟป
็ฟป่ฝฌๅพ็
่ฝฌ
่ฝฌๆขๅพ็ๆ ผๅผ
ๅพ
ๅพ็ๆทปๅ ๆฐดๅฐ
S
SVG ่ฝฌ PNG
ๅพ
ๅพ็่ฝฌ Base64
ๅ
ๅ่งๅค็
ๆทป
ๆทปๅ ่พนๆก
ๅพ
ๅพ็ๆปค้
่ฐ
่ฐๆดๅพ็
ๆจก
ๆจก็ณๅพ็
้
้ๅๅพ็
่ฃ
่ฃๅชไธบๆญฃๆนๅฝข
G
Grayscale Image
S
Sepia Image
P
Pixelate Image
S
Strip Image Metadata