# Archive Specifications

## Scope and Protocol Version

These specifications apply to recordings and drawings created beginning July
15, 2025 unless a metadata row documents a deviation.

The corresponding metadata identifier is:

```text
acquisition_protocol_version = standard-2025-07-15
```

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.

## Capture Configuration

The documented standard acquisition intent is:

- Capture orientation: Landscape
- Capture resolution class: 2160p UHD (4K)
- Still-image size: 4000 × 3000
- Exposure: Locked
- White balance: Locked

### Capture versus published encoding

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.

Do not infer a rotation, crop, or transcode solely from dimensions. Such a
transformation should be asserted only when supported by provenance evidence.

## Timing and Calibration Status

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

`encoded_frame_rate` is playback rate only. It must not be treated as original
drawing-time sampling.

## Drawing Surfaces

### 9 × 12 in

- Strathmore 300 Series Bristol
- Smooth surface
- 100 lb (270 g/m²)
- Acid free

### 11 × 14 in

- Strathmore 300 Series Bristol
- Smooth surface
- 100 lb (270 g/m²)
- Acid free

### 30 × 40 in

- Strathmore 500 Series Illustration Board
- Heavyweight vellum surface
- 20-ply
- White

Other support sizes and materials may appear when identified in the canonical
filename and metadata.

## Drawing Instruments and Ink

### Ballpoint

- Pelikan 337 Giant Ballpoint Refill
- Black
- Medium, 1.0 mm
- Document-proof ink conforming to ISO 12757-2

### Fountain pen

- Pilot Custom 823
- Aurora Black fountain pen ink

Additional tools and media are recorded at the individual-record level.

## Audio

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.

## Exceptions and Evidence

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.

When a property is not documented, it must remain unknown rather than being
reconstructed from visual appearance alone.