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Something for the dark top areas of your pages: Start by applying filter smart blur. It doesn't actually make your text more clear, but reduces the graininess of the unwanted noise by combining the particles. Play with the settings: As said, the smart blur step can be skipped, but there will be more fine grain in the end. Duplicate the layer. Apply heavy ...


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I tried playing with this - Photoshop may not be the most efficient. But if resetting the page isn't an option, you can create a duplicate layer, change blend mode to screen, and then also apply Brightness/Contrast adjustment. Use masks to save the areas to remain as original. I also found it an either/or situation - either a second layer with just ...


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still one more: remove smooth luminosity variations (=low spatial frequencies) by applying high pass filtering: Increase contrast to get black and white. Use curves. Let there be a non-vertical transition zone, do not apply steep tresholding because it generates harsh edges: There's still some color left. Desaturate to remove it, if needed. Just to show ...


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Photos of papers are almost always unevenly lighted. This makes using Levels very hard because it has to be a compromise between noise, leftover shading and losing lines. However, there's an easy solution. Like others have already suggested, first you need to pick a color channel with the least noise. In your case, I picked green. Copy it into a new document....


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