Replacing images of Lightslider plugin

I found how to do it, it was necessary to modify on the file .md and on the one of “lightslider.yaml” the option “text” and to pass it to “image”, on the other hand I have a question about the images to be included in the slider; it is necessary to modify its images before installing them in the folder “slider”, or if not is there a place where to regulate the final size of the images of the slider?
thank you in advance.jef

This topic does not correspond exactly to its title anymore, so I moved it here: Lightslider change the height of the scrolling slider in image mode***