Hello @renganathan
We have added overlay in image so that title can be readable. If you want to adjust the overlay transparency then add the following code in dashboard-> appearance -> customize -> additional css.
.inner-header-image .overlay { background: rgba( 0,0,0,0.2); } // note: you can change the last value from 0.1 to 0.9 as per your requirements.
Regards
Shark Themes