Play with the slider to change filter strength and see how each of them interact with the RGB circles.
None
filter: none
Blur
filter: blur(25px)
Brightness
filter: brightness(50%)
Contrast
filter: contrast(50%)
Grayscale
filter: grayscale(50%)
Hue-rotate
filter: hue-rotate(180deg)
Invert
filter: invert(50%)
Opacity
filter: opacity(50%)
Saturate
filter: staturate(50%)
Sepia
filter: sepia(50%)
Drop-shadow
filter: drop-shadow(0px 0px 10px #000000)