I'm working in a wordpress theme in which we have the usual header image. With help of CSS, it is possible to apply grayscale and brightness to such image. However, I need to enable some controls on the dashboard to let the user manage those properties as needed.
I don't know how to add those controls in the dashboard and get their value. Any help would be very appreciated. Thanks!
I have found what I was looking for, see the details in the next link. It is pretty well documented. Regards