Hide page titles

What is the reason you want to use images instead of text?
The reason I ask is that the answer to your question will most likely require custom coding and creation of a child theme. If you are comfortable doing that I can give you some help with this.

A much easier option is to pick a Google font and set all your header tags to that font. Check out this plugin – https://www.ads-software.com/plugins/wp-google-fonts/

ok you convinced me to go with the Google Fonts option!

Still would like to center the page title though

Got it centered, just added this code to the custom css field in the inkness settings.

h1 {
text-align: center;
}