[Black & White]
R=(R+G+B)/3
G=(R+G+B)/3
B=(R+G+B)/3

[Invert]
R=255-R
G=255-G
B=255-B

[Swap Red / Green]
R=G
G=R

[Swap  Green / Blue]
B=G
G=B

[Swap Red / Blue]
R=B
B=R

[Test]
R=R/2+B/2
G=G/2+B/2

[Lighter]
R=R+R/4
G=G+G/5
B=B+B/6

[Less color]
R=(R+R+R+R+G+B)/6
G=(G+G+G+R+G+B)/6
B=(B+B+B+R+G+B)/6

[Less color 2]
R=(R+R+R+R+R+R+G+B)/8
G=(G+G+G+G+G+R+G+B)/8
B=(B+B+B+B+B+R+G+B)/8

[Contrast]
R=(R+R+R+R)/3
G=(G+G+G+G)/3
B=(B+B+B+B)/3

[Less Contrast]
R=(R+R+R+R)/5
G=(G+G+G+G)/5
B=(B+B+B+B)/5

[AddRGB]
R=R+B+G
G=R+B+G
B=R+B+G

[Sepia]
R=R+(R+G+B)/10
G=G+(R+G+B)/20
B=B

[Darker]
R=(R+R+R+R)/5
G=(G+G+G+G)/5
B=(B+B+B+B)/5

