That is not the case in the U.S. Ernie. There is NO percentage by which an image can be changed to avoid copyright infringement.
https://topofy.com/how-avoid-copyright-infringement/

So posting this image here, found on Getty Images © (note the copyright icon) would be copyright infringement, unless it is listed as royalty free. In general, limited images/text used for non-commercial or educational purposes get a pass. A school art teacher can project images of art in the classroom; the textbook must get permission. The LCSCA site can't post extensive text from Brophy's or Houchins' works. There are a few images from Brophy's Plans & Specifications however.

[Linked Image from photos.smugmug.com]

Owners of internet sites (mostly business websites) have been successfully sued for allowing someone to post copyrighted material on their site.

https://sites.google.com/a/damascusknowledge.com/www/home