Quoting Trello Help: "In regular mode, cards become progressively more transparent and “fade out” the longer they remain untouched."
This makes them look really bad when they have photos in them. see below
Hi, team, Whether you've been hanging out here in the Trello collection for awhile, or whether you're just now joining us from the Trello Slack Community, we’ve got some exciting news about th...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events