How to use Image Quality and Blur Checker
- Upload a supported image.
- Choose the documented review thresholds.
- Inspect the measurements alongside the picture rather than treating them as an absolute verdict.
Example: Image Quality and Blur Checker
A local worked example using the inputs and settings below for image quality and blur checker.
Options
- Threshold
- The entered threshold is your review rule for the measured Laplacian variance. It is not a calibrated quality rating.
- Sampling
- Images are reduced to the documented longest side before measurement. Scale, texture, noise and transparency can change the result.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Compare like images under the same conditions
A noisy photo can have a high edge metric without useful detail. A smooth subject can have a low value despite being in focus. Use the measurement to order a manual review, then inspect the original at its intended size.
Questions about Image Quality and Blur Checker
Does a low metric always mean an out-of-focus photo?
No. A smooth sky or other textureless subject can also have little edge variation.
Can I compare values from differently sized images?
Sampling and scale affect the measure. Compare results under the same stated conditions and inspect the images.
Do dark pixels prove underexposure?
No. A dark subject can be intentional. The fraction is a review cue, not a camera diagnosis.