You can try something like the following example.If the dynamic service has different projection than web mercator, it will be reprojected on the fly.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<!--The viewport meta tag is used to improve the presentation and behavior of the samples
on iOS devices-->
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>Create Map and add a dynamic layer</title>
<link rel="stylesheet" href="http://js.arcgis.com/3.10/js/esri/css/esri.css"/>
<style>
html, body, #mapDiv{
padding: 0;
margin: 0;
height: 100%;
}
</style>
<script src="http://js.arcgis.com/3.10/"></script>
<script>
var map;
require([
"esri/map",
"esri/layers/ArcGISDynamicMapServiceLayer",
"esri/layers/ImageParameters"
], function (
Map, ArcGISDynamicMapServiceLayer, ImageParameters) {
map = new Map("mapDiv", {
basemap: "streets",
center: [-83.244, 42.581],
zoom: 15
});
var imageParameters = new ImageParameters();
imageParameters.format = "jpeg"; //set the image type to PNG24, note default is PNG8.
//Takes a URL to a non cached map service.
var dynamicMapServiceLayer = new ArcGISDynamicMapServiceLayer("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapSer...", {
"opacity" : 0.5,
"imageParameters" : imageParameters
});
map.addLayer(dynamicMapServiceLayer);
});
</script>
</head>
<body>
<div id="mapDiv"></div>
</body>
</html>
