You want to have an image slideshow on your website. Before you can add those images to the slideshow plugin however, you need to format the images so that they are not only optimized for the web, but also so that they are exactly the same size in width and height.
If you are a novice at working with images, here’s a tip for quickly creating a group of images that are all the same size:
Use blank PowerPoint slides, and put each image for your slideshow on its own slide in PowerPoint. Crop and otherwise edit the image on the slide, paying attention to how the slide looks in the PowerPoint show, not any “overhang” of the image.
When you have all the images into a PowerPoint slideshow, and are satisfied with how this show looks, in PowerPoint click on File – Export. Choose “Change File Type” and scroll down to choose JPEG. This option will export every slide presentation as its own .jpg file, all of them being exactly the same size.
You may still need to optimize these images for the web, and this is most easily accomplished by resizing all of the images to the same smaller width that you need in your slideshow.