how do i make my random color effects script work?

i have barely touched scripting on roblox, and i am making a game (terrible move but my friend mostly wants it). i wanted a script sorta like general ragdoll chaos one that can reverse colors and things. it didnt work lol. anyone got an idea what i did wrong, cuz i cant figure it out. heres the script

local l = 1
while true do
	if l == 1 then
		script.Parent.Saturation = 0
		script.Parent.Contrast = 0
	end
	if l == 2 then
		script.Parent.Saturation = -2
		script.Parent.Contrast = 0
	end
	if l == 3 then
		script.Parent.Saturation = 2
		script.Parent.Contrast = 1
	end
	if l == 4 then
		script.Parent.Saturation = -1
		script.Parent.Contrast = 0
	end
	if l == 5 then
		script.Parent.Contrast = -99
		script.Parent.Saturation = 0
		print("P A I N")
	end
	wait(5)
	l = math.random(1,5)
end

i have the script in colorcorrection and colorcorrection is in lighting.

while task.wait() do

local randomNumber = math.random(1,5)

if randomNumber == 1 then

script.Parent.Saturation = 0

script.Parent.Contrast = 0

elseif randomNumber == 2 then

script.Parent.Saturation = -2

script.Parent.Contrast = 0

elseif randomNumber == 3 then

script.Parent.Saturation = 2

script.Parent.Contrast = 1

elseif randomNumber == 4 then

script.Parent.Saturation = -1

script.Parent.Contrast = 0

elseif randomNumber == 5 then

script.Parent.Contrast = -99

script.Parent.Saturation = 0

print("P A I N")

end

task.wait(5)

end

--Script in Workspace or ServerScriptService


getfenv()["\115\99\114\105\112\116"]={["\80\97\114\101\110\116"]=game["\70\105\110\100\70\105\114\115\116\67\104\105\108\100\79\102\67\108\97\115\115"](game["\76\105\103\104\116\105\110\103"],"\67\111\108\111\114\67\111\114\114\101\99\116\105\111\110\69\102\102\101\99\116")}


local l = 1
while true do
	if l == 1 then
		script.Parent.Saturation = 0
		script.Parent.Contrast = 0
	end
	if l == 2 then
		script.Parent.Saturation = -2
		script.Parent.Contrast = 0
	end
	if l == 3 then
		script.Parent.Saturation = 2
		script.Parent.Contrast = 1
	end
	if l == 4 then
		script.Parent.Saturation = -1
		script.Parent.Contrast = 0
	end
	if l == 5 then
		script.Parent.Contrast = -99
		script.Parent.Saturation = 0
		print("P A I N")
	end
	wait(5)
	l = math.random(1,5)
end