Editing Images to Fit the Screen Resolution
You may find that your images are larger than the screen, forcing viewers to use the scroll bars to view the whole image. This is due to a high resolution of the images based on pixel size. The pixel dimensions of the image are too large for the screen.
Computer monitors, regardless of physical size, have a set number of pixels high and wide that it views. You can set this using start>settings>control panel>display>settings. Look for the "screen area" setting. The common resolutions are 1024x768 pixels (squeezes more onto your screen; things appear small), and 800x600 pixels (squeezes less onto your screen; things appear larger). Every user has this set to his/her viewing preference, which may be influenced by monitor size
Digital pictures downloaded from cameras tend to be larger than 1024 pixels wide by 768 pixels high. This means that you can't see the whole image on a screen set at this resolution (or at the 800x600 resolution). You need to use scroll bars to move around the image. Because of this, the downloaded pictures may not look the way you would prefer in a SlideShow presentation.
The solution is to edit the images so they are a smaller pixel size. A digital camera should have the software to do this, otherwise an image editing software such as Adobe Photoshop will do.
Every camera manufacturer has different image editing software, so you must review their instructions to learn how to. You'll need to spend some time getting to know the software. Once you get the hang of it, it shouldn't take more than 30-60 seconds to edit an image.