EXIF

EXIF (Exchangeable Image File Format)

EXIF is a metadata standard embedded in JPEG, TIFF, and RAW files that records camera settings and shooting conditions. It stores data like shutter speed, aperture, ISO, GPS location, date, camera model, and lens information.

รายละเอียดทางเทคนิค

EXIF data is stored as tagged key-value pairs in the APP1 marker segment of JPEG files. The specification defines over 100 standard tags across IFD0 (image), Exif IFD (camera), and GPS IFD (location) directories.

ตัวอย่าง

```javascript
// Read EXIF data from image file
const buffer = await file.arrayBuffer();
const view = new DataView(buffer);

// Check JPEG SOI marker
if (view.getUint16(0) === 0xFFD8) {
  // EXIF starts at APP1 marker (0xFFE1)
  // Fields: camera model, aperture, ISO, GPS coords
}

// Strip EXIF: re-draw on canvas → export (removes metadata)
```

รูปแบบที่เกี่ยวข้อง

.iso .jpeg .raw .tiff

เครื่องมือที่เกี่ยวข้อง

C Compress Image R Resize Image C Crop Image R Rotate Image F Flip Image C Convert Image W Watermark Image S SVG to PNG I Image to Base64 R Round Corners A Add Border I Image Filters A Adjust Image B Blur Image S Sharpen Image M Make Square G Grayscale Image S Sepia Image P Pixelate Image S Strip Image Metadata

คำศัพท์ที่เกี่ยวข้อง

Alpha Channel Bit Depth Chroma Subsampling AVIF Alpha Compositing Batch Resize Aspect Ratio Canvas