Trying to comment about the other sticky but thread is locked
So 20 percent of the image area?
Or
20 percent of 32 identifying structural points?
Because the four corners approach is 4 dark boxes on what looks like a total of 25.(dividing image into grid of 25 boxes and covering 4). This would only be covering 16% of the total image area.
However:
32*.2=6.4 round up to 7
7/32 = x/25
x = (7*25)/32 = 5.47 round up to 6
Need to cover 6 boxes to ensure over 20% of image is black
Trying to comment about the other sticky but thread is locked
So 20 percent of the image area?
Or
20 percent of 32 identifying structural points?
Because the four corners approach is 4 dark boxes on what looks like a total of 25.(dividing image into grid of 25 boxes and covering 4). This would only be covering 16% of the total image area.
However:
32*.2=6.4 round up to 7
7/32 = x/25
x = (7*25)/32 = 5.47 round up to 6
Need to cover 6 boxes to ensure over 20% of image is black