Photo Caption Exif Shutter Iso Verify Checker
Compare actual caller caption shutter/ISO values with separately decoded photo metadata under explicit relative tolerance and missing evidence; unlike metadata-key coverage this checks values, not EXIF authenticity, image manipulation or raw file parsing.
Description
Caption exposure values can be compared with separately decoded metadata.
Caption exposure values can be compared with separately decoded metadata. Missing metadata differs from a known mismatch.1
Enter positive caption shutter/ISO, availability flags, positive known metadata or exact zero when absent, and tolerance 0–1. Return relative differences or −1, strict-over-tolerance field names and unavailable names.
When to use Photo Caption Exif Shutter Iso Verify Checker
Use Photo Caption Exif Shutter Iso Verify Checker when you need to evaluate the supplied records under the calculation and evidence rules below. No EXIF decoding, authenticity or manipulation assessment is performed.
Prepare the actual editorial, source, layout, timing or audience records requested. Supply explicit house-policy limits and preserve missing evidence.
How to use Photo Caption Exif Shutter Iso Verify Checker and understand its results
- Prepare the actual editorial, source, layout, timing or audience records requested. Supply explicit house-policy limits and preserve missing evidence.
- Enter captionShutterSeconds, metadataShutterSeconds, captionIso, metadataIso, shutterMetadataAvailable, isoMetadataAvailable, callerRelativeExposureToleranceFraction using the field table and calculation rules, then run the tool.
- Read relativeShutterMismatchFraction, relativeIsoMismatchFraction, exposureMismatchFieldNames, unavailableExposureFieldNames. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| captionShutterSeconds | Caption shutter seconds | number | Required |
| metadataShutterSeconds | Metadata shutter seconds | number | Required |
| captionIso | Caption iso | number | Required |
| metadataIso | Metadata iso | number | Required |
| shutterMetadataAvailable | Shutter metadata available | boolean | Required |
| isoMetadataAvailable | Iso metadata available | boolean | Required |
| callerRelativeExposureToleranceFraction | Caller relative exposure tolerance fraction | number | Required |
Enter positive caption shutter/ISO, availability flags, positive known metadata or exact zero when absent, and tolerance 0–1. Return relative differences or −1, strict-over-tolerance field names and unavailable names.
relativeMismatch=abs(caption−metadata)/metadata Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| relativeShutterMismatchFraction | Relative shutter mismatch fraction | number |
| relativeIsoMismatchFraction | Relative iso mismatch fraction | number |
| exposureMismatchFieldNames | Exposure mismatch field names | list of string |
| unavailableExposureFieldNames | Unavailable exposure field names | list of string |
{
"input": {
"captionShutterSeconds": 0.01,
"metadataShutterSeconds": 0.02,
"captionIso": 100,
"metadataIso": 100,
"shutterMetadataAvailable": true,
"isoMetadataAvailable": true,
"callerRelativeExposureToleranceFraction": 0.1
},
"output": {
"relativeShutterMismatchFraction": 0.5,
"relativeIsoMismatchFraction": 0,
"exposureMismatchFieldNames": [
"shutterSeconds"
],
"unavailableExposureFieldNames": []
}
}Limitations and assumptions
No EXIF decoding, authenticity or manipulation assessment is performed.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Viral Claim Reverse Image Search Before Publish Checker: A reverse-image search can expose a source earlier than a caption’s claimed capture. Search completion and same-image evidence are separate recorded facts. For a complementary task, use Quote Context Truncation Full Clip Checker: A quote can be compared with an exact source slice. Available surrounding text differs from semantic fidelity.
References
Similar or alternative tools
- Viral Claim Reverse Image Search Before Publish Checker
A reverse-image search can expose a source earlier than a caption’s claimed capture. Search completion and same-image evidence are separate recorded facts.
- Quote Context Truncation Full Clip Checker
A quote can be compared with an exact source slice. Available surrounding text differs from semantic fidelity.