Hello,
Swipebox as no option to change the opacity (cf
swipebox.codes/
)
Colorbox has more options, maybe one controlling the size could help you (
www.jacklmoore.com/colorbox/
)
We can see to add some of these options in the plugin but I prefer not having too much elements to configure for them.
If you want to force a setting in a plugin for the moment, you need to edit the corresponding php file (lightbox_colorbox.php for colorbox) and add your parameters in the line of JavaScript which initialize the popup library.
.colorbox(/* insert parameters here */)
.swipebox(/* insert parameters here */)
With your feedbacks, we will be able to have a better vision on Libraries settings which are useful for some website, and we'll be able to add some of them directly available via the Joomla plugin manager.
Regards,