Canon EOS REBEL T3i
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MakerNote PresenceA proprietary manufacturer block inside EXIF whose format is largely undocumented. Contains settings not in standard EXIF — focus mode, scene detection, lens data, processing flags.
Rate at which this device embeds a MakerNote block (proprietary manufacturer metadata).
IPTC Metadata RateInternational Press Telecommunications Council — an editorial metadata standard for captions, copyright, and keywords. Usually added by software rather than written by cameras at capture.
Percentage of files that included IPTC metadata (typically editorial or copyright data).
SOF Compression TypeStart of Frame marker — identifies the JPEG compression algorithm. SOF0 = baseline DCT (most common); SOF2 = progressive DCT (multiple passes, common in web-optimised images).
JPEG compression markers (SOF0 = baseline, SOF2 = progressive).
| Observed value | |
|---|---|
| SOF0 |
JPEG Segment InventoryThe set of JPEG markers consistently present in output from this device. Marker presence and order are firmware-determined and can help distinguish camera lineages.
APP and SOF segments consistently present in output from this device.
| Observed value | |
|---|---|
| SOSStart of Scan — marks the beginning of the compressed image data stream. | |
| DQTDefine Quantization Table — the 64-value lossy compression matrix. Consistent per firmware; useful as a fingerprint. | |
| DHTDefine Huffman Table — the compression lookup table baked in by the encoder. | |
| APP1Primary metadata container — holds EXIF camera data (make, model, GPS, settings) and optionally XMP. | |
| SOF0Start of Frame, Baseline DCT — the most common JPEG compression type. | |
| SOIStart of Image — the 2-byte marker that opens every valid JPEG file. | |
| EOIEnd of Image — the 2-byte marker that closes every valid JPEG file. | |
| APP13IPTC data container — used by Photoshop and some cameras for editorial and copyright metadata. | |
| APP2ICC colour profile or FlashPix extension data. |
Metadata Block TypesThe metadata container formats found in files from this device — EXIF, IPTC, XMP, JFIF, and others. Different devices and software pipelines embed different combinations.
| Observed value | |
|---|---|
| Exif | |
| XAPEarly Adobe XMP namespace prefix (xap:) used before xmp: was standardised. Seen in older cameras and Photoshop CS versions. | |
| Photoshop 3.0 | |
| ICC_PROFILE |
EXIF VersionThe EXIF specification version string written by the device's firmware. Not user-adjustable — a firmware constant that can indicate manufacturing era.
EXIF specification version string encoded by this device's firmware. Not user-adjustable — firmware constant.
| Observed value | |
|---|---|
| Exif Version 2.3 |
Y/CbCr PositioningSpecifies how chroma channels (Cb, Cr) align with the luma channel (Y) during colour subsampling. Centred (1) or co-sited (2) — a firmware preference. Canon typically writes 2; Nikon and Sony write 1.
Colour channel alignment encoded by this device (1 = centred, 2 = co-sited). Manufacturer-determined — Canon typically writes 2, Nikon and Sony write 1.
| Observed value | |
|---|---|
| 2 |
Privacy Risk SignalsFields that may contain personally-identifying information. Presence rate is shown; individual values are never stored or displayed.
Rate at which files from this device contained personally identifying metadata fields. Individual values are never shown.
Your photos carry this device fingerprint.
Vaultify strips device metadata before sharing — and can hide a private message inside your photo, invisible to forensic scanners like these.
