Four Color Ramp

set cut_paste_input [stack 0]
version 5.2300
Group {
inputs 0
name Grad
selected true
xpos -4063
ypos -2354
addUserKnob {20 User}
addUserKnob {41 format T Constant2.format}
addUserKnob {41 LLColor T Expression2.LLColor}
addUserKnob {41 LRColor T Expression2.LRColor}
addUserKnob {41 URColor T Expression2.URColor}
addUserKnob {41 ULColor T Expression2.ULColor}
}
Constant {
inputs 0
channels rgb
name Constant2
xpos -469
ypos -253
}
Expression {
temp_name0 LLCorner
temp_expr0 (1-x/width)*(1-y/height)
temp_name1 LRCorner
temp_expr1 (x/width)*(1-y/height)
temp_name2 URCorner
temp_expr2 (x/width)*(y/height)
temp_name3 ULCorner
temp_expr3 (1-x/width)*(y/height)
expr0 LLColor.r*LLCorner+LRColor.r*LRCorner+URColor.r*URCorner+ULColor.r*ULCorner
expr1 LLColor.g*LLCorner+LRColor.g*LRCorner+URColor.g*URCorner+ULColor.g*ULCorner
expr2 LLColor.b*LLCorner+LRColor.b*LRCorner+URColor.b*URCorner+ULColor.b*ULCorner
name Expression2
xpos -469
ypos -174
addUserKnob {20 User}
addUserKnob {18 LLColor}
LLColor {1 0 0}
addUserKnob {18 LRColor}
LRColor {0 1 0}
addUserKnob {18 URColor}
URColor {0 0 1}
addUserKnob {18 ULColor}
ULColor {0 0 0}
}
Output {
name Output1
xpos -469
ypos -74
}
end_group

Ivan Busquets via http://community.foundry.com/discuss/topic/97059