I used few effect on scroll, so I'm not sure which one you are talking about specifically, but most of the effects are done using gsap library: greensock.com/gsap/. It takes quite some time to get familiar with it, but you can do a lot of thing, svg manipulation for instance, but also smooth image transition on scroll, really awesome tool.
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What is that background effect on scroll called? How can I implement that ??
I used few effect on scroll, so I'm not sure which one you are talking about specifically, but most of the effects are done using gsap library: greensock.com/gsap/. It takes quite some time to get familiar with it, but you can do a lot of thing, svg manipulation for instance, but also smooth image transition on scroll, really awesome tool.