Need help to create grayscale scroll

Hello everyone i hope you are well.
Im struggling to make something like this https://www.google.com/search?q=scroll+alpha+grayscale&tbm=isch&ved=2ahUKEwiAovy4u7DmAhUZ04UKHWIoBp4Q2-cCegQIABAC&oq=scroll+alpha+grayscale&gs_l=mobile-gws-wiz-img.3…7003.11934..12941…0.0..0.150.1322.0j10……0….1………30i10j33i10.AHteCKavXdQ&ei=82HyXcDcI5mmlwTi0JjwCQ&bih=768&biw=393&client=ms-android-xiaomi-rev1&prmd=inv&tbs=ic%3Aspecific%2Cisc%3Ablack&hl=el#imgrc=ELymdNKW5Z2AwM
How you would be do…
Need help to create grayscale scroll

See original post by invalid@example.com (TasosJewelry)