The Data Format phase establishes the foundation for all WIA-ART-001 interoperability. This chapter provides detailed technical specifications for file formats, metadata schemas, color management, and quality tiers that ensure digital artwork can be reliably created, exchanged, and preserved across any platform or tool that implements the standard.
Understanding these specifications is essential for developers building WIA-compliant applications. The format requirements balance comprehensive functionality with practical implementability, ensuring that both simple tools and sophisticated platforms can participate in the standardized ecosystem.
WIA-ART-001 supports a carefully selected set of file formats that together address the needs of different digital art workflows. Each format has specific requirements for compliance, ensuring consistent interpretation across implementations.
| Format | Use Case | Bit Depth | Requirements |
|---|---|---|---|
| PNG | Lossless, web, archival | 8, 16-bit | ICC profile, metadata chunks |
| JPEG | Photos, web distribution | 8-bit | Quality ≥85, EXIF 2.3+ |
| TIFF | Archival, print | 8, 16, 32-bit | Lossless compression only |
| WebP | Modern web | 8-bit | Lossless mode for art |
PNG (Portable Network Graphics) serves as the primary format for lossless digital artwork. All WIA-compliant implementations MUST support PNG with the following specifications:
{
"format": "PNG",
"version": "1.2",
"compression": "deflate",
"bitDepth": [8, 16],
"colorType": ["truecolor", "truecolor-alpha"],
"requiredChunks": {
"iCCP": "ICC color profile (REQUIRED)",
"iTXt": "UTF-8 metadata (REQUIRED)",
"tEXt": "ASCII metadata (RECOMMENDED)",
"tIME": "Modification timestamp (RECOMMENDED)"
}
}
JPEG remains essential for photographic content and web distribution. While lossy compression is inherent to the format, quality parameters ensure acceptable fidelity:
For vector artwork, SVG (Scalable Vector Graphics) is the primary format:
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:wia="https://wia.org/standards/ART-001/v1"
version="1.1"
viewBox="0 0 1000 1000">
<metadata>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dc="http://purl.org/dc/elements/1.1/">
<rdf:Description rdf:about="">
<dc:title>Artwork Title</dc:title>
<dc:creator>Artist Name</dc:creator>
<dc:rights>© 2025 Artist Name</dc:rights>
</rdf:Description>
</rdf:RDF>
</metadata>
<!-- Artwork content -->
</svg>
For three-dimensional digital art, glTF 2.0 is the standard format:
{
"asset": {
"version": "2.0",
"generator": "WIA-ART-001 Exporter v1.0"
},
"extensionsUsed": [
"KHR_materials_pbrSpecularGlossiness",
"WIA_art_metadata"
],
"extensions": {
"WIA_art_metadata": {
"title": "3D Sculpture",
"artist": "Artist Name",
"created": "2025-01-15T10:30:00Z",
"license": "CC BY-SA 4.0"
}
}
}
The metadata schema defines how information about digital artwork is structured and stored. This comprehensive schema accommodates technical, descriptive, administrative, and preservation metadata.
{
"@context": "https://wia.org/standards/ART-001/v1",
"@type": "DigitalArtwork",
"id": "uuid:12345678-1234-1234-1234-123456789abc",
"version": "1.0",
"timestamp": "2025-01-15T10:30:00Z",
"artwork": {
"title": "Sunset Over Mountains",
"subtitle": "Evening Light Series #3",
"description": "A digital painting capturing...",
"created": "2025-01-15T10:30:00Z",
"modified": "2025-01-16T14:00:00Z"
},
"artist": {
"name": "Jane Doe",
"id": "did:wia:artist:jane-doe",
"url": "https://artist.example.com",
"nationality": "US"
},
"technical": {
"medium": "digital-painting",
"format": {
"mimeType": "image/png",
"extension": "png"
},
"dimensions": {
"width": 4096,
"height": 2160,
"unit": "px",
"dpi": 300
},
"color": {
"space": "Adobe RGB",
"profile": "Adobe RGB (1998)",
"bitDepth": 16
},
"fileSize": 52428800,
"checksum": {
"algorithm": "SHA-256",
"value": "a1b2c3d4..."
}
},
"rights": {
"copyright": "© 2025 Jane Doe",
"license": {
"type": "CC-BY-SA-4.0",
"url": "https://creativecommons.org/licenses/by-sa/4.0/"
}
}
}
| Field | Type | Description |
|---|---|---|
| id | string | UUID v4 or URI identifier |
| artwork.title | string | 1-200 characters |
| artist.name | string | Creator's name or pseudonym |
| technical.format.mimeType | string | IANA media type |
| technical.dimensions | object | Width, height, unit |
| rights.copyright | string | Copyright notice |
Valid values for the technical.medium field:
Consistent color reproduction across devices requires proper color management. All WIA-compliant artwork MUST specify color space and embed appropriate ICC profiles.
| Color Space | Usage | Gamut | Profile |
|---|---|---|---|
| sRGB | Web, general use | Standard | IEC 61966-2-1 |
| Adobe RGB | Professional print | Wide | Adobe RGB (1998) |
| Display P3 | Modern displays | Wide | Display P3 |
| ProPhoto RGB | Archival, editing | Ultra-wide | ROMM RGB |
Different use cases require different quality levels. The standard defines three tiers:
{artist-slug}_{artwork-slug}_{version}_{variant}.{ext}
Examples:
jane-doe_sunset-mountains_v1_master.tiff
jane-doe_sunset-mountains_v1_web.jpg
jane-doe_sunset-mountains_v1_thumb.webp
All WIA-compliant files MUST pass these validation checks:
Chapter 5 covers Phase 2: API Interface specification, detailing the REST API endpoints, TypeScript SDK, and authentication mechanisms that enable programmatic access to WIA-compliant artwork data.