This was quick and easy. I'll have to do this with some of the other photos I scanned in groups.
Greta_Sports Cards 1
This is one of my older scans, before I realised I could select and scan them separately with my scanner's software.
Greta_Sports Cards 2
I put the cropped and straightened photos on a red background for contrast.
Greta_Sports Cards 3
I cut a bit off the bottom of the one with the white background. For the others I selected the problem areas and filled with the blue. I also fixed a few random spots and scuffs using the same method. Now they look even better than the originals.