| # Archive Specifications |
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|
| ## Scope and Protocol Version |
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| These specifications apply to recordings and drawings created beginning July |
| 15, 2025 unless a metadata row documents a deviation. |
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| The corresponding metadata identifier is: |
|
|
| ```text |
| acquisition_protocol_version = standard-2025-07-15 |
| ``` |
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|
| The identifier records the governing protocol. It does not imply that every |
| published file has identical encoded dimensions, orientation, codec, audio, or |
| post-processing history. |
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| ## Capture Configuration |
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| The documented standard acquisition intent is: |
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| - Capture orientation: Landscape |
| - Capture resolution class: 2160p UHD (4K) |
| - Still-image size: 4000 × 3000 |
| - Exposure: Locked |
| - White balance: Locked |
|
|
| ### Capture versus published encoding |
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| Capture orientation and stored pixel orientation are separate properties. |
| `metadata.csv` fields `width_px`, `height_px`, and `orientation` describe the |
| published encoded file. Many canonical files are stored as portrait video, |
| including records that historical evidence identifies as rotations or crops of |
| landscape sources. |
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| Do not infer a rotation, crop, or transcode solely from dimensions. Such a |
| transformation should be asserted only when supported by provenance evidence. |
|
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| ## Timing and Calibration Status |
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| The current protocol documentation does not yet provide a complete calibrated |
| time base for motor-control or physical-trajectory measurement. In particular, |
| the following may be unknown for a recording unless separately documented: |
|
|
| - original frame-capture interval |
| - real drawing-session duration |
| - time-lapse acceleration factor |
| - source-frame timestamps |
| - removed pauses or edit decisions |
| - dropped-frame history |
| - camera model, lens, and mount geometry |
| - pixel-to-physical coordinate mapping or homography |
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| `encoded_frame_rate` is playback rate only. It must not be treated as original |
| drawing-time sampling. |
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| ## Drawing Surfaces |
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| ### 9 × 12 in |
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| - Strathmore 300 Series Bristol |
| - Smooth surface |
| - 100 lb (270 g/m²) |
| - Acid free |
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| ### 11 × 14 in |
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| - Strathmore 300 Series Bristol |
| - Smooth surface |
| - 100 lb (270 g/m²) |
| - Acid free |
|
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| ### 30 × 40 in |
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| - Strathmore 500 Series Illustration Board |
| - Heavyweight vellum surface |
| - 20-ply |
| - White |
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| Other support sizes and materials may appear when identified in the canonical |
| filename and metadata. |
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| ## Drawing Instruments and Ink |
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| ### Ballpoint |
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| - Pelikan 337 Giant Ballpoint Refill |
| - Black |
| - Medium, 1.0 mm |
| - Document-proof ink conforming to ISO 12757-2 |
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| ### Fountain pen |
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| - Pilot Custom 823 |
| - Aurora Black fountain pen ink |
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| Additional tools and media are recorded at the individual-record level. |
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| ## Audio |
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| Audio presence is a stored-file property, not a required part of the acquisition |
| protocol. `has_audio` records whether an audio stream exists. It does not |
| describe the stream's contents or establish redistribution rights for music, |
| speech, notifications, or other incidental sound. |
|
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| ## Exceptions and Evidence |
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| Known departures from the protocol should be documented in the affected |
| metadata row. A deviation claim should identify its evidence in `notes` and, |
| where applicable, provenance fields. |
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| When a property is not documented, it must remain unknown rather than being |
| reconstructed from visual appearance alone. |
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|
