A binary image is a digital image that has only two possible values for each pixel. A picture of the red blood cells.
<a href="//commons.wikimedia.org/w/index.php?title=User:Przemyslawtarka95&amp;action=edit&amp;redlink=1" class="new" title="User:Przemyslawtarka95 (page does not exist)">Przemysław Tarka</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>