Minor text/typographic improvements on opening text

[mprove]

Currently it reads:
Gain richer access to the world's image and audio/visual files
IIIF is an open standard for delivering high-quality, attributed digital objects online at scale. It’s also an international community developing and implementing the IIIF APIs, backed by a consortium of leading academic and cultural institutions.

a) "world’s" should use an apostrophe.
b) What is the difference between image and visual files? audio/visual is video, right? Maybe better write: "… image, audio and video files"
c) the word "online" is redundant and might be removed.