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Mask color array #65

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Mask color array #65

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cc49823
Require label color image to be integer
manics Aug 18, 2020
42ab909
Change label colors attr from dict to array of colors
manics Aug 18, 2020
784b850
label values: only use non-negative values
manics Aug 18, 2020
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12 changes: 7 additions & 5 deletions spec.md
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Original file line number Diff line number Diff line change
Expand Up @@ -130,16 +130,18 @@ Unlisted groups MAY be masks.

### "color"

The `color` key defines an image that is "labeled", i.e. every unique value in the image
The `color` key defines an integer image that is "labeled", i.e. every unique non-negative value in the image
represents a unique, non-overlapping object within the image. The value associated with
the `color` key is another JSON object in which the key is the pixel value of the image and
the value is an RGBA color (4 byte, `0-255` per channel) for representing the object:
the `color` key is a JSON array in which the index is the pixel value of the image and
the value is an RGBA color (4 byte, `0-255` per channel) for representing the object, or `null` if no color is set:
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We should say something about how the 4-bytes are converted to a single int, e.g. signed/unsigned, big/little endian


```
{
"color": {
"1": 8388736,
"color": [
null,
8388736,
...
]
```
### "image"

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