I was scanning my color prints and while postprocessing them, after descreen, I had noticed a trend that there were always a lot of dust and scratches on the darker part of the image, while the brighter areas didn't have any problem. I'm not sure what they are, I'm guessing dust or paper texture/scratches? Why is that? Is there something wrong with my scanner?
Update post with sample images. The top is the original and the bottom is image after descreen.