So we have digitized some wood textures in JPG files. But as the scanning was not perfect, some variations in brightness appear as lines. Because I need to use these woods in 3D renderings and catalogs, I need to have uniform brightness on them. I have tried to use some methods in internet tutorials, but they either did not work or completely changed the appearance of the image. I will link one of the textures as an example below to illustrate the lines I am talking about.
Any advice on a tool to remove these lines and have a uniform brightness on the photo? Please note that I can't just use the clone stamp because the lines are across the width of the image, using the clone stamp will make big seams across the picture.