The illustration that follows is a portion of a scan of my birth certificate. You will notice that the pink background is visible on the left, and virtually invisible on the right; however, you will notice the large diagonal letters from the word “VOID” on the right. The two scans are pretty much at the same resolution and scanned with the same settings. Why are they so very different?
I got a new scanner since 2010 when the certificate scan on the left was made. That’s why they are different. The raised seal (on another part of the certificate) is invisible on my old scanner but rather easy to see on the new.
I point this out just to say that valid comparisons require controls on equipment.