What this workspace does
A transparent reference-scale calculation.
Image Inspector · browser local
Estimate a real-world length from a photo reference.
Open an image, enter a known reference length and its pixel length, then enter the measured object pixels. Aftermath calculates the proportional estimate locally.
Use it accurately
Perspective, lens distortion, and a reference at a different depth can make a photo measurement inaccurate. Treat it as an estimate, not a survey result.
Private browser processing
Selected files are processed in the current browser session. Aftermath has no account, cloud file storage, or server-side file-processing job.
What this tool checks
Estimate a real-world length from one photo only when you can supply a known reference length and the relevant pixel measurements. The browser calculates a proportional local estimate and keeps the image in the current session. Perspective, lens distortion, an imprecise reference, and measurement placement can make the estimate unsuitable for technical, medical, legal, or safety decisions.
What to choose and what you get
What to choose
- one image plus a known reference length and pixel measurements
Result
- a proportional local length estimate
Supported formats
- Accepted formats: JPG, PNG, WebP.
- Output formats: HTML report.
Browser support and permissions
- Modern browser with JavaScript, a supported image decoder, and enough memory for the selected image.
- No camera, microphone, or screen permission is needed.
Worked example
A product photo contains a 100 mm reference card and an unknown object whose length can be compared on the same plane.
Starting facts
- The reference and target are visible in one image.
- Perspective can distort objects that are at different depths.
Observed operation: Mark the reference endpoints, enter 100 mm, then mark the target endpoints so the browser calculates a proportional estimate.
Review the result: Record the estimated length together with the chosen reference and repeat the points if the marks do not align cleanly.
Boundary: The estimate is not calibrated metrology and cannot correct perspective, lens distortion or an inaccurate reference length.
Check your result
- Perspective, lens distortion, and a reference at a different depth can make a photo measurement inaccurate. Treat it as an estimate, not a survey result.
Things to know
- The measured result still needs review against the intended destination or use.
Privacy boundary
The selected image stays in the current browser session and is not sent to an Aftermath processing service. How local processing is verified.
What this tool verifies
Checks the displayed limits and reports or creates a proportional local length estimate from one image plus a known reference length and pixel measurements.
Check before sharing
A local measurement or export does not guarantee acceptance by an external destination.