Before calling a thermal follow-up image better or worse, compare its recorded scale and capture conditions with the earlier image. A change in displayed colour alone is too little evidence for a maintenance conclusion.
Check that the pair is comparable
| Comparison item | Question for the reviewer |
|---|---|
| Asset and viewpoint | Are the same area and relevant features shown? |
| Operating conditions | Were load and other task conditions recorded? |
| Image presentation | Are palette, scale and any enhancement changes documented? |
| Measurement information | What readings and settings were actually retained? |
| File history | Can each presentation copy be linked to its original output? |
In its own camera guidance, FLIR explains automatic and manual thermal image scales. This illustrates why presentation settings matter when comparing images. It does not establish that a Phonemax app offers the same controls or follows the same adjustment procedure.
State the limits of the comparison
If a scale, setting or operating condition is missing, record the gap. Ask the responsible thermography reviewer whether the files support the intended conclusion or whether a controlled follow-up is needed. Do not recreate missing measurements from colours or label a cosmetic contrast change as a verified temperature improvement.
Keep the visual comparison separate from any acceptance-critical measurement or defect diagnosis. An appealing enhanced image and a valid maintenance decision require different evidence. No before-and-after inspection or measurement trial is reported here.
The P20 Pro product information identifies a thermal imaging phone but does not verify AI defect detection or your app’s comparison controls. Use the feature-evidence guide and confirm the delivered app and reporting options with Phonemax before setting an inspection workflow.
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