How to flatten a photo with a wrinkled background in potoshop cs3

You can select "Pen Tool" in the left toolbar, frame the file, then CTRL+ENTER, right-click and select "Free Transform", then move the mouse to any of the four corners of the picture, hold down CTRL and pull the mouse until the adjustment is satisfactory.

2. Paper wrinkles and stains:

You can see a band-aid tool in the toolbar, then press and hold the tool with the left key, and then four sub-tools will pop up. Select "Spot Repair Brush Tool" and click on the crease to repair it. However, if there are irregular patterns, creases will not be available. My humble opinion can only use the "brush" tool, then enlarge the picture, press "ALT" next to the place to be mended to get the color, and then apply it to the crease with the selected color.

? Of course, the best way is to take out the original and scan it.