Giving properties to Zoomify layers in OpenLayers?

Question

I am using OpenLayers.Layer.Zoomify to show large image files and this works like a charm. The only thing is that I would like to add some options to that layer ( opacity and transitionEffect) but it doesn't seem to work. Code:

var zoomify = new OpenLayers.Layer.Zoomify( "Zoomify",
  zoomify_url, 
  new OpenLayers.Size( zoomify_width, zoomify_height ),
  { opacity: 0.5, transitionEffect: 'resize'}
);

Isn't this the right way of doing it? Or is it not possible to add these properties to Zoomify layers? Nothing happens to my zoomify layer.

Answer 1

Layer Opacity control

var map = null;
    var shade = null;
    var maxOpacity = 0.9;
    var minOpacity = 0.1;
    function changeOpacity(byOpacity) {
        var newOpacity = (parseFloat(OpenLayers.Util.getElement('opacity').value) + byOpacity).toFixed(1);
        newOpacity = Math.min(maxOpacity,
                              Math.max(minOpacity, newOpacity));
        OpenLayers.Util.getElement('opacity').value = newOpacity;
        shade.setOpacity(newOpacity);
    }

http://dev.openlayers.org/releases/OpenLayers-2.12/examples/layer-opacity.html