Disable parallax header images

If you want to disable the parallax effect and use the image header with a certain size, use this custom CSS code  inside the dedicated area for  Custom CSS Code under the Theme Options Panel:

.page-id-19 .header-image {  
   background-attachment: scroll !important;   
   background-position: center center !important; 
}

This code would make the header image be it's normal size (obviously, it will still be resized and cropped a bit, in order to fill the entire screen width). It will have effect on the page with the id  19, but you can change that id to the desired page. Or add multiple page id's, or add the code for the entire site:

.page-id-19 .header-image, .page-id-20 .header-image { ....
.header-image { ...