How to search fast for a color within a region?

I'm trying to check for a color in a given region but to search for 100 pixels takes about 16 seconds with the function bellow:

for i = 1, 100 do

 local r, g, b = getColor(Region(1, i, 1, 1))



 print("i: " .. i .. ", r: " .. r .. ", g: " .. g .. ", b: " .. b)

 -- do something
end

So I took a screen shot and made a 1px with the color I wanted, but it always returns true with the code below, even if I put exact() and the color is not at the region:

pmColor = Pattern("pm-color.png"):exact()

if messageArea:exists(pmColor) then

 scriptExit("found")

end


How may I make this better in performance or is there a better way to find for a specific color within a region?

Thanks in advance!