diff --git a/C/rainbow.c b/C/rainbow.c
index c214ff0..9feca1e 100644
--- a/C/rainbow.c
+++ b/C/rainbow.c
@@ -24,10 +24,10 @@ int main(void)
             int r = (int)(255.0 * (0.5 + 0.5*sin(t*a + (double)(x) / 50.0)));
             int g = (int)(255.0 * (0.5 + 0.5*sin(0.8 + t*b + (double)(x) / 50.0)));
             int b = (int)(255.0 * (0.5 + 0.5*sin(1.3 + t*c + (double)(x) / 50.0)));
-            btui_set_bg_rgb(bt,
-                            (r < 0 ? 0 : (r > 255 ? 255 : r)),
-                            (g < 0 ? 0 : (g > 255 ? 255 : g)),
-                            (b < 0 ? 0 : (b > 255 ? 255 : b)));
+            btui_set_bg(bt,
+                        (r < 0 ? 0 : (r > 255 ? 255 : r)),
+                        (g < 0 ? 0 : (g > 255 ? 255 : g)),
+                        (b < 0 ? 0 : (b > 255 ? 255 : b)));
             btui_puts(bt, " ");
         }
         btui_flush(bt);
diff --git a/Lua/lbtui.c b/Lua/lbtui.c
index 30ff74a..06a67cd 100644
--- a/Lua/lbtui.c
+++ b/Lua/lbtui.c
@@ -149,13 +149,16 @@ static int Lbtui_withfg(lua_State *L)
     if (bt == NULL) luaL_error(L, "Not a BTUI object");
     if (lua_gettop(L) < 5) luaL_error(L, "Expected r,g,b values and a function");
     int isnum;
-    int r = lua_tointegerx(L, 2, &isnum);
-    if (!isnum) luaL_error(L, "Expected integer r value");
-    int g = lua_tointegerx(L, 3, &isnum);
-    if (!isnum) luaL_error(L, "Expected integer g value");
-    int b = lua_tointegerx(L, 4, &isnum);
-    if (!isnum) luaL_error(L, "Expected integer b value");
-    btui_set_fg_rgb(*bt, r, g, b);
+    lua_Number r = lua_tonumberx(L, 2, &isnum);
+    if (!isnum) luaL_argerror(L, 2, "expected number for red value");
+    lua_Number g = lua_tonumberx(L, 3, &isnum);
+    if (!isnum) luaL_argerror(L, 3, "expected number for green value");
+    lua_Number b = lua_tonumberx(L, 4, &isnum);
+    if (!isnum) luaL_argerror(L, 4, "expected number for blue value");
+    btui_set_fg(*bt,
+                r < 0.0 ? 0 : (r > 1.0 ? 255 : (int)(255.0 * r)),
+                g < 0.0 ? 0 : (g > 1.0 ? 255 : (int)(255.0 * g)),
+                b < 0.0 ? 0 : (b > 1.0 ? 255 : (int)(255.0 * b)));
     int top = lua_gettop(L);
     int status = lua_pcall(L, 0, LUA_MULTRET, 0);
     btui_set_attributes(*bt, BTUI_FG_NORMAL);
@@ -170,13 +173,16 @@ static int Lbtui_withbg(lua_State *L)
     if (bt == NULL) luaL_error(L, "Not a BTUI object");
     if (lua_gettop(L) < 5) luaL_error(L, "Expected r,g,b values and a function");
     int isnum;
-    int r = lua_tointegerx(L, 2, &isnum);
-    if (!isnum) luaL_error(L, "Expected integer r value");
-    int g = lua_tointegerx(L, 3, &isnum);
-    if (!isnum) luaL_error(L, "Expected integer g value");
-    int b = lua_tointegerx(L, 4, &isnum);
-    if (!isnum) luaL_error(L, "Expected integer b value");
-    btui_set_bg_rgb(*bt, r, g, b);
+    lua_Number r = lua_tonumberx(L, 2, &isnum);
+    if (!isnum) luaL_argerror(L, 2, "expected number for red value");
+    lua_Number g = lua_tonumberx(L, 3, &isnum);
+    if (!isnum) luaL_argerror(L, 3, "expected number for green value");
+    lua_Number b = lua_tonumberx(L, 4, &isnum);
+    if (!isnum) luaL_argerror(L, 4, "expected number for blue value");
+    btui_set_bg(*bt,
+                r < 0.0 ? 0 : (r > 1.0 ? 255 : (int)(255.0 * r)),
+                g < 0.0 ? 0 : (g > 1.0 ? 255 : (int)(255.0 * g)),
+                b < 0.0 ? 0 : (b > 1.0 ? 255 : (int)(255.0 * b)));
     int top = lua_gettop(L);
     int status = lua_pcall(L, 0, LUA_MULTRET, 0);
     btui_set_attributes(*bt, BTUI_BG_NORMAL);
diff --git a/Lua/test.lua b/Lua/test.lua
index dd469a4..b676695 100644
--- a/Lua/test.lua
+++ b/Lua/test.lua
@@ -16,7 +16,7 @@ btui(function(bt)
 
         bt:clear()
         bt:move(x, y)
-        bt:withbg(150,225,80, function()
+        bt:withbg(.8,.95,.2, function()
             bt:withfg(0,0,0, function()
                 bt:print(" Pressed: ", key, " ")
             end)
diff --git a/btui.h b/btui.h
index 48e761f..1dc6649 100644
--- a/btui.h
+++ b/btui.h
@@ -35,8 +35,8 @@ int btui_move_cursor(btui_t *bt, int x, int y);
 char *btui_keyname(int key, char *buf);
 int btui_keynamed(const char *name);
 int btui_set_attributes(btui_t *bt, attr_t attrs);
-int btui_set_fg_rgb(btui_t *bt, unsigned char r, unsigned char g, unsigned char b);
-int btui_set_bg_rgb(btui_t *bt, unsigned char r, unsigned char g, unsigned char b);
+int btui_set_fg(btui_t *bt, unsigned char r, unsigned char g, unsigned char b);
+int btui_set_bg(btui_t *bt, unsigned char r, unsigned char g, unsigned char b);
 int btui_set_fg_hex(btui_t *bt, int hex);
 int btui_set_bg_hex(btui_t *bt, int hex);
 #define btui_printf(bt, ...) fprintf((bt)->out, __VA_ARGS__)
@@ -497,12 +497,12 @@ int btui_move_cursor(btui_t *bt, int x, int y)
     return fprintf(bt->out, "\033[%d;%dH", y+1, x+1);
 }
 
-int btui_set_fg_rgb(btui_t *bt, unsigned char r, unsigned char g, unsigned char b)
+int btui_set_fg(btui_t *bt, unsigned char r, unsigned char g, unsigned char b)
 {
     return fprintf(bt->out, "\033[38;2;%d;%d;%dm", r, g, b);
 }
 
-int btui_set_bg_rgb(btui_t *bt, unsigned char r, unsigned char g, unsigned char b)
+int btui_set_bg(btui_t *bt, unsigned char r, unsigned char g, unsigned char b)
 {
     return fprintf(bt->out, "\033[48;2;%d;%d;%dm", r, g, b);
 }