In order to get the correct slider background image sizes, please follow the steps below.
Step 1:
Please import Slider Revolution Samples from Dashboard > Vamtam > Quick Import (if you've already done that, please skip the step)
Step 2:
Please go to Dashboard > Slider Revolution > hit the Settings button of the slider you'd like to get the correct background image sizes from:
Step 3:
Check or edit the Layers Size (Width and Height)
A common question once images are resized is: “Why are my images being cropped and some portions of the image can’t be seen?” The answer is - unless the image’s original size is equal to the slider’s “Layers Size”, the image will need to be stretched and cropped. To avoid this, set your slider’s “Layers Size” to equal the exact size of your image’s original size.
We recommend you to check this article for the ideal image size: https://www.themepunch.com/faq/ideal-image-size/