What is the recommended image size/pixel size/resolution for images added to my Wix site? - 575301962
Pixel Dimensions for Strip Slideshow?
What are the ideal pixel dimensions for the strip slideshow?
Reply from Bender | March 18, 2014
Since the Strip Slideshow gallery is very wide (matches the screen width, which typically is in the 1024 - 1920 range), the best way to prepare pictures for it is to have their width around 1280 pixels or more, and their height much smaller.
If you're using Chrome I suggest this extension, which allows you to quickly determine both size and dimensions of an image.