shading calibration

[gerhards74690563]

Hello,

is it possible to calibrate a picture for uneven illumination? E.g.: If I want to show the structure of an oil painting, I have to light it mainly from one side, which mostly causes a falloff in lightness from one side to the other. My aim to overcome this, is to light the painting properly so it´s structures show in the right way, take a picture, take it off the wall an take a picture of a plain white board under the same lighting conditions. This latter photo should deliver me kind of a profile to correct the light falloff in Lightroom classic. It should do the same job as the lightness and colour part of a lens profile. Is it possible to apply that photo as a profile to the photo of the painting?

Thank you very much,

Gerhard

[Bob Somrak]

Maybe the Flat Field correction would work. See here

https://helpx.adobe.com/lightroom-classic/help/flat-field-correction.html

[ManiacJoe]

My first thought is to use the gradient tool to adjust the brightness.