Gunakan link ini untuk mendapatkan filter warna sesuai keinginan:
https://angel-rs.github.io/css-color-filter-generator/
misal
hijau
filter: brightness(0) saturate(100%) invert(76%) sepia(68%) saturate(7285%) hue-rotate(96deg) brightness(128%) contrast(123%);
biru
filter: brightness(0) saturate(100%) invert(8%) sepia(99%) saturate(7166%) hue-rotate(247deg) brightness(104%) contrast(144%);
merah
filter: brightness(0) saturate(100%) invert(19%) sepia(95%) saturate(7202%) hue-rotate(358deg) brightness(109%) contrast(112%);
bentuk di atas formatnya untuk css
di javascript tinggal hilangkan kata filter
var biru = "brightness(0) saturate(100%) invert(8%) sepia(99%) saturate(7166%) hue-rotate(247deg)"
masukkan di ctx
ctx.filter = biru;