Thermal Follow-Up Images: Compare the Scale Before the Colour

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

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.