Reply To: Genesis Slider Image Size

Do you have a link to your site so I can take a look?

Also, it’s recommended (for all WordPress users) to download and install a plugin called Regenerate Thumbnails. Once you install and run this plugin it will automatically adjust all of your images and thumbnails to the sizes you have specified throughout your theme.

So anytime you change the size to your Slider images, run this plugin and it will make sure all of your images are set to that specific size as much as possible without stretching or shrinking the image while maintaining the best quality.