The largest image rendered in AEM is according to the configurations in "Day CQ DAM Buffered Image Cache" service. As the image cross the size of 1024px(default), the image is resized. But your local has some different value(I guess). Please refer below URLs, it might help. https://helpx.adobe.com/e...

We will face the above situation, when the uploaded image has a width more than 1280px. AbstractImageServlet.ImageContext has a layer of max width 1280px. As you have uploaded an image of width 2048px, it's resized. If you try an image having width less then 1280px, it will not be resized.However, y...