I am facing this issue from long time and search many time but can't get any usefull solution.
In finder we can see image as thumb. But background of thumb is white color.
And if image is white than both color match and we see just white square.
Due to this its become hard to get right. I have to go through all image preview to select one.
Is there any way to change background color of thumb? Or any other way to deal with this problem?