diff --git a/README.md b/README.md
index 635ffdb..062937a 100644
--- a/README.md
+++ b/README.md
@@ -286,7 +286,7 @@ moonshine.effects.desaturate
 
 Name | Type | Default
 -----|------|--------
-tint | color / table of numbers | {255,255,255}
+tint | color / table of numbers | {1,1,1}
 strength | number between 0 and 1 | 0.5
 
 
@@ -312,7 +312,7 @@ DMG ships with 7 palettes:
 7. `pocket`
 
 Custom palettes must be in the format `{{R,G,B}, {R,G,B}, {R,G,B}, {R,G,B}}`,
-where `R`, `G`, and `B` are numbers between `0` and `255`.
+where `R`, `G`, and `B` are numbers between `0` and `1`.
 
 
 <a name="effect-fastgaussianblur"></a>
diff --git a/desaturate.lua b/desaturate.lua
index 8a55217..dd51230 100644
--- a/desaturate.lua
+++ b/desaturate.lua
@@ -29,10 +29,11 @@ return function(moonshine)
 
   setters.tint = function(c)
     assert(type(c) == "table" and #c == 3, "Invalid value for `tint'")
+    assert(c[1] <= 1, "Colors should be normalized in [0,1]")
     shader:send("tint", {
-      (tonumber(c[1]) or 0) / 255,
-      (tonumber(c[2]) or 0) / 255,
-      (tonumber(c[3]) or 0) / 255,
+      (tonumber(c[1]) or 0),
+      (tonumber(c[2]) or 0),
+      (tonumber(c[3]) or 0),
       1
     })
   end
@@ -41,7 +42,7 @@ return function(moonshine)
     shader:send("strength", math.max(0, math.min(1, tonumber(v) or 0)))
   end
 
-  local defaults = {tint = {255,255,255}, strength = 0.5}
+  local defaults = {tint = {1,1,1}, strength = 0.5}
 
   return moonshine.Effect{
     name = "desaturate",
diff --git a/filmgrain.lua b/filmgrain.lua
index 8491f17..7044567 100644
--- a/filmgrain.lua
+++ b/filmgrain.lua
@@ -18,7 +18,7 @@ PERFORMANCE OF THIS SOFTWARE.
 return function(moonshine)
   local noisetex = love.image.newImageData(256,256)
   noisetex:mapPixel(function()
-    local l = love.math.random() * 255
+    local l = love.math.random()
     return l,l,l,l
   end)
   noisetex = love.graphics.newImage(noisetex)
diff --git a/scanlines.lua b/scanlines.lua
index 590abe3..fb5423d 100644
--- a/scanlines.lua
+++ b/scanlines.lua
@@ -57,10 +57,11 @@ return function(moonshine)
   end
   setters.color = function(c)
     assert(type(c) == "table" and #c == 3, "Invalid value for `color'")
+    assert(c[1] <= 1, "Colors should be normalized in [0,1]")
     shader:send("color", {
-      (tonumber(c[1]) or defaults.color[0]) / 255,
-      (tonumber(c[2]) or defaults.color[1]) / 255,
-      (tonumber(c[3]) or defaults.color[2]) / 255
+      (tonumber(c[1]) or defaults.color[1]),
+      (tonumber(c[2]) or defaults.color[2]),
+      (tonumber(c[3]) or defaults.color[3])
     })
   end
 
diff --git a/sketch.lua b/sketch.lua
index befe213..dcd4844 100644
--- a/sketch.lua
+++ b/sketch.lua
@@ -26,7 +26,7 @@ SOFTWARE.
 return function(moonshine)
   local noisetex = love.image.newImageData(256,256)
   noisetex:mapPixel(function()
-    return love.math.random() * 255,love.math.random() * 255, 0, 0
+    return love.math.random(),love.math.random(), 0, 0
   end)
   noisetex = love.graphics.newImage(noisetex)
   noisetex:setWrap ("repeat", "repeat")
diff --git a/vignette.lua b/vignette.lua
index 3021801..f13fb8b 100644
--- a/vignette.lua
+++ b/vignette.lua
@@ -37,10 +37,11 @@ return function(moonshine)
   end
   setters.color = function(c)
     assert(type(c) == "table" and #c == 3, "Invalid value for `color'")
+    assert(c[1] <= 1, "Colors should be normalized in [0,1]")
     shader:send("color", {
-      (tonumber(c[1]) or 0) / 255,
-      (tonumber(c[2]) or 0) / 255,
-      (tonumber(c[3]) or 0) / 255,
+      (tonumber(c[1]) or 0),
+      (tonumber(c[2]) or 0),
+      (tonumber(c[3]) or 0),
       1
     })
   end