Corpus: `smk-public-visual-v1`

Milestone 2 freezes the first corpus for openly reusable visual/colour analysis. Membership is stored on every canonical entity and materialized in data/processed/smk-public-visual-v1.parquet.

Exact inclusion predicate

An entity is included only when all conditions hold:

canonicalization is resolved;
explicit canonical public_domain == true;
canonical rights semantic is PDM or CC0;
the atomic canonical image bundle is complete;
image width and height are positive (part of bundle completeness);
canonical colors is a non-empty list;
there is no unresolved image-bundle conflict.

The rule does not require physical dimensions, English metadata, visual scalar fields, weighted palettes or enrichment data.

Membership

Measure	Count
Canonical entities	203,023
Included	27,254
Excluded	175,769

Exclusion reasons are non-exclusive:

Code	Count
`NO_USABLE_IMAGE`	163,059
`NO_COLORS`	150,774
`NOT_PUBLIC_DOMAIN`	50,512
`RIGHTS_NOT_OPEN`	50,512
`IMAGE_CONFLICT`	3
`CANONICALIZATION_UNRESOLVED`	1

Milestone 1 observed about 39.5k public-domain rows with an image/public URL. Recomputed at entity level, that broad candidate definition contains 39,508 entities. All 27,254 corpus members overlap it. The stricter corpus is smaller because it additionally requires a complete atomic image bundle and non-empty colors; it is not forced to an expected count.

Included-data diagnostics

321 included entities have no normalized physical dimension;
25,065 lack a complete Netto width × height pair;
871 have partial visual fields;
missing visual values: saturation 871, brightness 62, contrast 62, entropy 1, colortemp 1;
143 included entities have a colortemp quality flag.

Physical and visual missingness does not exclude a work because those properties are independent of whether its primary image and source colours are usable.

Shared object numbers

There are 306 object_number groups containing more than one canonical SMK entity; the largest contains 24 entities. Nineteen such groups contain corpus members, representing 35 included entities. Members remain separate entities. data/processed/object-number-groups.parquet provides the relationship for later analysis/UI without destructive merging.

Artifacts

data/processed/artworks.parquet — every canonical SMK entity;
data/processed/smk-public-visual-v1.parquet — included entities;
data/reports/corpus-membership.parquet — decision and reason codes for every entity;
data/processed/object-number-groups.parquet — non-destructive accession-number grouping;
data/reports/milestone2-summary.json — machine-readable counts and rule parameters.

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Corpus: smk-public-visual-v1