that's confusing
maybe it would be clearer if the setting would be called "Data Saver (Legacy Reader)"
and to use the same terms for on/compressed and off/original
or, obviously, don't use 2 settings for the same thing
(but maybe some people are so eccentric and want to use 2 different settings...
what's the difference between "Data saver: On" in Site Settings (https://mangadex.org/settings)
and "Data saver: Compressed Images" in Reader Settings?
notice, that you cannot take a photo with this orientation while holding the smart phone like her.
(the edges of the photo are always parallel to the smart phone)
@Kami_Nana one special type of glass is pure quartz (it's not used very often couse of the high temperature needed to melt it)
https://en.wikipedia.org/wiki/Fused_quartz