While taking photos at a wedding, I had flickering issues. One of the priests asked me to put my camera to silent mode and didn't notice that I'm taking photos with flickers then.
How can I fix the flickering?
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Slightly different technique from the ones expounded in the answer linked on the comments. Using Gimp but PS should be able to do it too.
You are fortunate enough to have a plain wall in the background, so from that we can extract the actual flicker information, if we assume that the wall should be a uniform color to start with.
Foreground to background (RGB)