# canvas.capture
mutation write
Use when the requested change exactly matches canvas.capture; read the current state first when a version or identifier may have changed.
## Before calling
- Authenticate as the accountable Enhance person.
- Use only resource identifiers returned by an earlier capability result or supplied by the person.
- Reuse clientToken only when retrying this exact mutation input.
## Input
Show complete JSON Schema
```json
{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"canvasRef":{"type":"string","minLength":1},"waitMs":{"default":1500,"description":"Additional local polling after the server returns an active job; render creation retains its existing bounded HTTP deadline.","type":"integer","minimum":0,"maximum":5000},"baseVersion":{"type":"integer","exclusiveMinimum":0,"maximum":9007199254740991},"source":{"type":"object","properties":{"kind":{"type":"string","const":"recording"},"recordingId":{"type":"string","format":"uuid","pattern":"^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$"},"atMs":{"type":"integer","minimum":0,"maximum":9007199254740991}},"required":["kind","recordingId","atMs"],"additionalProperties":false},"previewJobId":{"type":"string","format":"uuid","pattern":"^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$","description":"The successful canvas_render job whose pixels you inspected at this exact recording time and canvas version."},"placement":{"type":"object","properties":{"kind":{"type":"string","const":"below-source"}},"required":["kind"],"additionalProperties":false}},"required":["canvasRef","baseVersion","source","previewJobId","placement"],"additionalProperties":false}
```
### Example
Show example input
```json
{
"canvasRef": "00000000-0000-4000-8000-000000000010",
"baseVersion": 1,
"source": {
"kind": "recording",
"recordingId": "00000000-0000-4000-8000-000000000010",
"atMs": 500
},
"previewJobId": "00000000-0000-4000-8000-000000000010",
"placement": {
"kind": "below-source"
},
"waitMs": 1500
}
```
## Result
Returns a typed canvas.capture result from the Enhance API without transport-specific prose.
## Recovery
- BAD_REQUEST: correct the named fields and call again.
- UNAUTHORIZED: restore Enhance authentication, then retry once.
- FORBIDDEN or NOT_FOUND: check the supplied resource and selection; do not substitute unrelated content. Ask for corrected access or scope if needed.
- CONFLICT: read the current resource, merge the intended change, and retry with its version.
- INTERNAL: run Enhance diagnostics, report the failure, and stop repeating the call.
## Continue with
- Read the affected canvas resource to confirm the result.
Compatibility: `219dfc283ee61d5bf1305c451a464c8d2e9b5de80191b78b773f547a51867d61`.