Thank you for your answer

I’ve tried that already and it didn’t work for me because I’ve enabled the next and previous sliders to search within a single category only and this plugin cancels that.

Thanks Josue,
This is what I ended up using :)

<script>
var ratio = 1.5;
var factor = 0.75;
var global_window_height = jQuery(window).height();

function myfunction() {
var window_height = jQuery(window).height();
var container_width = parseFloat(jQuery(‘.entry-content’).css(‘width’));
var new_height = factor * window_height;
var new_width = new_height/ratio;
if (new_width > container_width) {
new_width = container_width;
new_height = new_width*ratio;
}
jQuery(‘.avia-gallery-big-inner img’).css(‘height’, new_height);
jQuery(‘.avia-gallery-big-inner img’).css(‘width’, new_width);
}

jQuery(window).on(‘resize’, myfunction);
jQuery(window).on(‘load’,myfunction);
</script>

problem existed between keyboard and chair
sorry!