diff --git a/src/get_colors.rs b/src/get_colors.rs
index 10ebe2b..8b83049 100644
--- a/src/get_colors.rs
+++ b/src/get_colors.rs
@@ -7,7 +7,8 @@ use std::collections::HashSet;
 use std::fs::read;
 use std::process::exit;
-fn adjust_rgb(r: u8, g: u8, b: u8, brightness: i8, saturation: i8) -> (u8, u8, u8) {
+fn adjust_rgb(r: u8, g: u8, b: u8, brightness: i16, saturation: i16) -> (u8, u8, u8) {
+    let saturation = saturation + 50;
let avg = ((r as u16 + g as u16 + b as u16) / 3) as f32;
 let r = ((r as f32 - avg) * (saturation as f32 / 100.0) + avg + brightness as f32)

@@ -32,15 +33,15 @@ fn to_gray(r: u8, g: u8, b: u8, v: f32) -> (u8, u8, u8) {
)
}
-fn generate_variation(color: (u8, u8, u8), offset: i8) -> (u8, u8, u8) {
+fn generate_variation(color: (u8, u8, u8), offset: i16) -> (u8, u8, u8) {

...

diff --git a/src/get_colors.rs b/src/get_colors.rs
index 10ebe2b..8b83049 100644
--- a/src/get_colors.rs
+++ b/src/get_colors.rs
@@ -7,7 +7,8 @@ use std::collections::HashSet;
 use std::fs::read;
 use std::process::exit;
-fn adjust_rgb(r: u8, g: u8, b: u8, brightness: i8, saturation: i8) -> (u8, u8, u8) {
+fn adjust_rgb(r: u8, g: u8, b: u8, brightness: i16, saturation: i16) -> (u8, u8, u8) {
+    let saturation = saturation + 50;
let avg = ((r as u16 + g as u16 + b as u16) / 3) as f32;
 let r = ((r as f32 - avg) * (saturation as f32 / 100.0) + avg + brightness as f32)

@@ -32,15 +33,15 @@ fn to_gray(r: u8, g: u8, b: u8, v: f32) -> (u8, u8, u8) {
)
}
-fn generate_variation(color: (u8, u8, u8), offset: i8) -> (u8, u8, u8) {
+fn generate_variation(color: (u8, u8, u8), offset: i16) -> (u8, u8, u8) {
adjust_rgb(color.0, color.1, color.2, offset, 50)
}
pub fn get_colors(
image_path: &str,
send: bool,
-    brightness: Option<i8>,
-    saturation: Option<i8>,
+    brightness: Option<i16>,
+    saturation: Option<i16>,
) -> (Vec<(u8, u8, u8)>, u8) {
let core_image = match image::open(image_path) {
Ok(img) => img,
@@ -120,7 +121,7 @@ pub fn get_colors(
let mut i = 0;
while collect_rgb.len() <= 21 {
let base = collect_rgb[i % collect_rgb.len()];
-        let variation = generate_variation(base, 10 * (i as i8 + 1));
+        let variation = generate_variation(base, 10 * (i as i16 + 1));
collect_rgb.push(variation);
i += 1;
}
@@ -141,15 +142,15 @@ pub fn get_colors(
r,
g,
b,
-            brightness.unwrap_or(0) - 15,
-            saturation.unwrap_or(0) + 80,
+            brightness.unwrap_or(0),
+            saturation.unwrap_or(0) + 90,
);
done.push((r, g, b));
}
 let (mut r, mut g, mut b) = collect&#95;rgb&#91;20&#93;;

-    (r, g, b) = adjust_rgb(r, g, b, 40, 60);
-    (r, g, b) = to_gray(r, g, b, 0.4);
+    (r, g, b) = adjust_rgb(r, g, b, 40, 80);
+    (r, g, b) = to_gray(r, g, b, 0.55);
done[7] = (r, g, b);
done[15] = (r, g, b);
(done, *alpha)
diff --git a/src/main.rs b/src/main.rs
index a1ee538..0e27c11 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -57,7 +57,7 @@ struct Arg {
long = "saturation",
description = "set saturation value (-128 to 127)"
)]
-    saturation: Option<i8>,
+    saturation: Option<i16>,
 #&#91;argh(
     option,

@@ -65,7 +65,7 @@ struct Arg {
long = "brightness",
description = "set brightness value (-128 to 127)"
)]
-    brightness: Option<i8>,
+    brightness: Option<i16>,
 #&#91;argh(
     switch,