lensprofile giving crazy, off the chart results

[Daniel Zielinski]

Outlandish values were creating huge loops in the lines produced. Could not read the values on the Y axis. Was driving me nuts, but then I tried changing the angle of the light on the chart and...problem solved! The chart I'm using is printed on photopaper and it has a gloss. Get the lighting angle wrong and the lensprofile chart has a fit. Other charts look mostly normal. The chart orientation numbers were all less than 0.10. That doesn't matter if the lighting angle is creating some kind of reflection...I guess.

[Frans van den Bergh]

Hi Daniel,

Those lensprofile charts are indeed wild!

If you still have them, would you mind sending me a sample image of the "bad" lighting orientation? I should be able to use that to improve the sanity checks (involving each slanted-edge measurement) to prevent such disasters in the future. First prize would be if I can generate an appropriate warning, but I cannot promise that just yet.

Regards,
Frans