John Rostron

Roy,

I'm not sure why you directed this question to me. I profess no especial expertise at this sort of thing.

Having said that, I cannot see anything that I would describe as waves. By 'Background', do you mean the Background Layer or the background areas of the image? I tried removing the visibility of all your adjustments so as to just look at the Background Layer and could still see no waves.

Sometimes a regular artefact (such as waves) can be fixed by a Fast Fourier Analysis (FFT) filter (Filters > Noise > FFT Denoise...) but when I tried this, there were no obvious artefacts.

I would suggest that you post this on the regular Questions about Affinity in the forum. Please feel free to include my comments should you wish to.

John

Sorry, it was not my intention to bug you, but, I was reading one of your answers and at the bottom say messages, so I wrote my question to you. Sorry, I will not ask again. Thanks for your time. 

That's OK. I don't mind being asked questions. I wouldn't want to put people off asking, even if I cannot help.

John