An overview of video formats and ratios: <br>Old style NTSC monitors and projectors are 4:3 format. That is, a ratio of four units wide and three high. 4x3 inches, 4x3 feet, 20x15 inches, etc. Modern HD monitors are 16:9 format, or 16 units wide, 9 units high. Your computer monitor/screen is most likely yet a different ratio. OpenLP "sees" and adjusts to the projection monitor you are using. It will adjust to your computer screen if not external monitor is connected, a 4x3 NTSC monitor or a 16x9 monitor. In other words, it matters if an external monitor is connected and it matters the format of the external monitor.<br>To get to your specific issue, It appears your theme image is square format. OpenLP is showing the complete image and filling in the sides with black bars. You will need to crop your cloud photo to the ratio of your projection monitor. There is a lot of software that can do this, I use Photoshop Elements, but GIMP is free Pixlr is a free on-line photo editor. OpenLP does not automatically format your background images to the projector's ratio if they are mis-matched. <br>I had this same issue when I first started looking at OpenLP. Black bars would appear and disappear, font sizes seemed to shrink and grow. Once I discovered OpenLP was adjusting the output based on the connected monitor, it was a simple task to set an override to match the monitor (projector) resolution and match my background images and font sizes for the final viewing format and resolution.<br><br>I hope this was clear and gets you on the path to understanding how OpenLP works in your particular setup.<br><br>p.s. I I forget and leave the "Override" button checked, the image on our church's monitor is crazy big... about 5 times larger than the screen. The monitor only shows the upper left corner of the slide. If I forget to select the Override option when I am planning the service at home, I have black bars on the top and bottom of my theme and the text formatting is the wrong size.