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Add label properties description to spec #79

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Add label properties description to spec #79

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27 changes: 23 additions & 4 deletions spec.md
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,12 @@ should ignore all except the _last_ entry.
Some implementations may represent overlapping labels by using a specially assigned
value, for example the highest integer available in the pixel range.

The `properties` key defines a list of JSON objects which also describes the unique
label values. Each entry in the list MUST contain the key "label-value" with the
pixel value for that label. Additionally, an arbitrary number of key-value pairs
MAY be present for each label value denoting associated metadata. Not all label
values must share the same key-value pairs within the properties list.

The `source` key is an optional dictionary which contains information on the
image the label is associated with. If included it MAY include a key `image`
whose value is the relative path to a Zarr image group. The default value is
Expand All @@ -171,11 +177,24 @@ above).
"rgba": [0, 255, 255, 128]
},
...
],
"properties": [
{
"label-value": 1,
"area (pixels)": 1200,
"class": "foo"

},
{
"label-value": 4,
"area (pixels)": 1650
},
...
]
},
"source": {
"image": "../../"
}
},
"source": {
"image": "../../"
}
]
```

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