This is an example post to show the effect of different images widths when posting an inline image. As you can see the wide image will make long sentences like this break off the screen and you will see a scroll bar at the bottom of the browser window (depending on the browser and your screen size).
Please keep your inline images below 1000~1200 pixels wide. You can use the resize function before uploading an image to our recommended image hosts.
For more information of posting images to the forum see this topic