diff --git a/Cargo.toml b/Cargo.toml
index 2ba28e0..565e5ca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,6 @@
 [workspace]
 
 members = [
+	"cmdapp",
     "webapp",
 ]
\ No newline at end of file
diff --git a/cmdapp/.gitignore b/cmdapp/.gitignore
new file mode 100644
index 0000000..18e5178
--- /dev/null
+++ b/cmdapp/.gitignore
@@ -0,0 +1,3 @@
+*.svg
+*.png
+*.jpg
\ No newline at end of file
diff --git a/cmdapp/Cargo.toml b/cmdapp/Cargo.toml
new file mode 100644
index 0000000..e1ee0f1
--- /dev/null
+++ b/cmdapp/Cargo.toml
@@ -0,0 +1,15 @@
+    [package]
+    name = "vtracer"
+    version = "0.1.0"
+    authors = ["Chris Tsang <tyt2y7@gmail.com>"]
+    edition = "2018"
+    description = "A cmd app to convert images into vector graphics."
+    homepage = "http://www.visioncortex.org/vtracer"
+    repository = "https://github.com/visioncortex/vtracer/"
+    categories = ["graphics"]
+    keywords = ["svg", "computer-graphics"]
+
+    [dependencies]
+    clap = "2.33.3"
+    image = "0.23.10"
+    visioncortex = { path = "../visioncortex" }
\ No newline at end of file
diff --git a/cmdapp/src/config.rs b/cmdapp/src/config.rs
new file mode 100644
index 0000000..ba26490
--- /dev/null
+++ b/cmdapp/src/config.rs
@@ -0,0 +1,297 @@
+use std::path::PathBuf;
+use clap::{Arg, App};
+use visioncortex::path::PathSimplifyMode;
+use super::util::{path_simplify_mode, preset, deg2rad};
+
+pub enum Preset {
+    Bw,
+    Poster,
+    Photo
+}
+
+#[derive(Debug)]
+pub struct Config {
+    pub input_path: PathBuf,
+    pub output_path: PathBuf,
+    pub color_mode: String,
+    pub filter_speckle: usize,
+    pub color_precision: i32,
+    pub layer_difference: i32,
+    pub mode: PathSimplifyMode,
+    pub corner_threshold: i32,
+    pub length_threshold: f64,
+    pub max_iterations: usize,
+    pub splice_threshold: i32,
+}
+
+#[derive(Debug)]
+pub struct ConverterConfig {
+    pub input_path: PathBuf,
+    pub output_path: PathBuf,
+    pub color_mode: String,
+    pub filter_speckle_area: usize,
+    pub color_precision_loss: i32,
+    pub layer_difference: i32,
+    pub mode: PathSimplifyMode,
+    pub corner_threshold: f64,
+    pub length_threshold: f64,
+    pub max_iterations: usize,
+    pub splice_threshold: f64,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            input_path: PathBuf::default(),
+            output_path: PathBuf::default(),
+            color_mode: String::from("color"),
+            mode: path_simplify_mode("spline"),
+            filter_speckle: 4,
+            color_precision: 6,
+            layer_difference: 16,
+            corner_threshold: 60,
+            length_threshold: 4.0,
+            splice_threshold: 45,
+            max_iterations: 10,
+        }
+    }
+}
+
+impl Config {
+    pub fn from_args() -> Self {
+        let app = App::new("visioncortex VTracer").about("A cmd app to convert images into vector graphics.");
+
+        let app = app.arg(Arg::with_name("input")
+            .long("input")
+            .short("i")
+            .takes_value(true)
+            .help("Path to input raster image")
+            .required(true));
+
+        let app = app.arg(Arg::with_name("output")
+            .long("output")
+            .short("o")
+            .takes_value(true)
+            .help("Path to output vector graphics")
+            .required(true));
+
+        let app = app.arg(Arg::with_name("color_mode")
+            .long("colormode")
+            .takes_value(true)
+            .help("True color image `color` (default) or Binary image `bw`"));
+
+        let app = app.arg(Arg::with_name("preset")
+            .long("preset")
+            .takes_value(true)
+            .help("Use one of the preset configs `bw`, `poster`, `photo`"));
+
+        let app = app.arg(Arg::with_name("filter_speckle")
+            .long("filter_speckle")
+            .short("f")
+            .takes_value(true)
+            .help("Discard patches smaller than X px in size"));
+
+        let app = app.arg(Arg::with_name("color_precision")
+            .long("color_precision")
+            .short("p")
+            .takes_value(true)
+            .help("Number of significant bits to use in an RGB channel"));
+
+        let app = app.arg(Arg::with_name("gradient_step")
+            .long("gradient_step")
+            .short("g")
+            .takes_value(true)
+            .help("Color difference between gradient layers"));
+
+        let app = app.arg(Arg::with_name("corner_threshold")
+            .long("corner_threshold")
+            .short("c")
+            .takes_value(true)
+            .help("Minimum momentary angle (degree) to be considered a corner"));
+
+        let app = app.arg(Arg::with_name("segment_length")
+            .long("segment_length")
+            .short("l")
+            .takes_value(true)
+            .help("Perform iterative subdivide smooth until all segments are shorter than this length"));
+
+        let app = app.arg(Arg::with_name("splice_threshold")
+            .long("splice_threshold")
+            .short("s")
+            .takes_value(true)
+            .help("Minimum angle displacement (degree) to splice a spline"));
+
+        let app = app.arg(Arg::with_name("mode")
+            .long("mode")
+            .short("m")
+            .takes_value(true)
+            .help("Curver fitting mode `pixel`, `polygon`, `spline`"));
+
+        // Extract matches
+        let matches = app.get_matches();
+
+        let mut config = Config::default();
+        let input_path = matches.value_of("input").expect("Input path is required, please specify it by --input or -i.");
+        let output_path = matches.value_of("output").expect("Output path is required, please specify it by --output or -o.");
+
+        if let Some(value) = matches.value_of("preset") {
+            config = Self::from_preset(preset(value), input_path, output_path);
+        }
+
+        config.input_path = PathBuf::from(input_path);
+        config.output_path = PathBuf::from(output_path);
+
+        if let Some(value) = matches.value_of("color_mode") {
+            config.color_mode = String::from(if value.trim() == "bw" || value.trim() == "BW" {"binary"} else {"color"})
+        }
+
+        if let Some(value) = matches.value_of("mode") {
+            let value = value.trim();
+            config.mode = path_simplify_mode(if value == "pixel" {
+                "none"
+            } else if value == "polygon" {
+                "polygon"
+            } else if value == "spline" {
+                "spline"
+            } else {
+                panic!("Parser Error: Curve fitting mode is invalid with value {}", value);
+            });
+        }
+
+        if let Some(value) = matches.value_of("filter_speckle") {
+            if value.trim().parse::<usize>().is_ok() { // is numeric
+                let value = value.trim().parse::<usize>().unwrap();
+                if value < 1 || value > 16 {
+                    panic!("Out of Range Error: Filter speckle is invalid at {}. It must be within [1,16].", value);
+                }
+                config.filter_speckle = value;
+            } else {
+                panic!("Parser Error: Filter speckle is not a positive integer with value {}.", value);
+            }
+        }
+
+        if let Some(value) = matches.value_of("color_precision") {
+            if value.trim().parse::<i32>().is_ok() { // is numeric
+                let value = value.trim().parse::<i32>().unwrap();
+                if value < 1 || value > 8 {
+                    panic!("Out of Range Error: Color precision is invalid at {}. It must be within [1,8].", value);
+                }
+                config.color_precision = value;
+            } else {
+                panic!("Parser Error: Color precision is not an integer with value {}.", value);
+            }
+        }
+
+        if let Some(value) = matches.value_of("gradient_step") {
+            if value.trim().parse::<i32>().is_ok() { // is numeric
+                let value = value.trim().parse::<i32>().unwrap();
+                if value < 0 || value > 255 {
+                    panic!("Out of Range Error: Gradient step is invalid at {}. It must be within [0,255].", value);
+                }
+                config.layer_difference = value;
+            } else {
+                panic!("Parser Error: Gradient step is not an integer with value {}.", value);
+            }
+        }
+
+        if let Some(value) = matches.value_of("corner_threshold") {
+            if value.trim().parse::<i32>().is_ok() { // is numeric
+                let value = value.trim().parse::<i32>().unwrap();
+                if value < 0 || value > 180 {
+                    panic!("Out of Range Error: Corner threshold is invalid at {}. It must be within [0,180].", value);
+                }
+                config.corner_threshold = value
+            } else {
+                panic!("Parser Error: Corner threshold is not numeric with value {}.", value);
+            }
+        }
+
+        if let Some(value) = matches.value_of("segment_length") {
+            if value.trim().parse::<f64>().is_ok() { // is numeric
+                let value = value.trim().parse::<f64>().unwrap();
+                if value < 3.5 || value > 10.0 {
+                    panic!("Out of Range Error: Segment length is invalid at {}. It must be within [3.5,10].", value);
+                }
+                config.length_threshold = value;
+            } else {
+                panic!("Parser Error: Segment length is not numeric with value {}.", value);
+            }
+        }
+
+        if let Some(value) = matches.value_of("splice_threshold") {
+            if value.trim().parse::<i32>().is_ok() { // is numeric
+                let value = value.trim().parse::<i32>().unwrap();
+                if value < 0 || value > 180 {
+                    panic!("Out of Range Error: Segment length is invalid at {}. It must be within [0,180].", value);
+                }
+                config.splice_threshold = value;
+            } else {
+                panic!("Parser Error: Segment length is not numeric with value {}.", value);
+            }
+        }
+
+        config
+    }
+
+    pub fn from_preset(preset: Preset, input_path: &str, output_path: &str) -> Self {
+        let input_path = PathBuf::from(input_path);
+        let output_path = PathBuf::from(output_path);
+        match preset {
+            Preset::Bw => Self {
+                input_path,
+                output_path,
+                color_mode: String::from("binary"),
+                filter_speckle: 4,
+                color_precision: 6,
+                layer_difference: 16,
+                mode: path_simplify_mode("spline"),
+                corner_threshold: 60,
+                length_threshold: 4.0,
+                max_iterations: 10,
+                splice_threshold: 45,
+            },
+            Preset::Poster => Self {
+                input_path,
+                output_path,
+                color_mode: String::from("color"),
+                filter_speckle: 4,
+                color_precision: 8,
+                layer_difference: 16,
+                mode: path_simplify_mode("spline"),
+                corner_threshold: 60,
+                length_threshold: 4.0,
+                max_iterations: 10,
+                splice_threshold: 45,
+            },
+            Preset::Photo => Self {
+                input_path,
+                output_path,
+                color_mode: String::from("color"),
+                filter_speckle: 10,
+                color_precision: 8,
+                layer_difference: 48,
+                mode: path_simplify_mode("spline"),
+                corner_threshold: 180,
+                length_threshold: 4.0,
+                max_iterations: 10,
+                splice_threshold: 45,
+            }
+        }
+    }
+
+    pub fn into_converter_config(self) -> ConverterConfig {
+        ConverterConfig {
+            input_path: self.input_path,
+            output_path: self.output_path,
+            color_mode: self.color_mode,
+            filter_speckle_area: self.filter_speckle * self.filter_speckle,
+            color_precision_loss: 8 - self.color_precision,
+            layer_difference: self.layer_difference,
+            mode: self.mode,
+            corner_threshold: deg2rad(self.corner_threshold),
+            length_threshold: self.length_threshold,
+            max_iterations: self.max_iterations,
+            splice_threshold: deg2rad(self.splice_threshold),
+        }
+    }
+}
diff --git a/cmdapp/src/converter.rs b/cmdapp/src/converter.rs
new file mode 100644
index 0000000..da01b94
--- /dev/null
+++ b/cmdapp/src/converter.rs
@@ -0,0 +1,129 @@
+use std::path::PathBuf;
+use std::{fs::File, io::Write};
+
+use visioncortex::Color;
+use visioncortex::{ColorName, color_clusters::RunnerConfig};
+use visioncortex::{ColorImage, color_clusters::Runner};
+use super::config::{Config, ConverterConfig};
+use super::svg::SvgFile;
+
+pub fn convert_image_to_svg(config: Config) -> Result<(), String> {
+    let config = config.into_converter_config();
+    if config.color_mode == "color" {
+        color_image_to_svg(config)
+    } else if config.color_mode == "binary" {
+        binary_image_to_svg(config)
+    } else {
+        Err(format!("Unknown color mode: {}", config.color_mode))
+    }
+}
+
+pub fn color_image_to_svg(config: ConverterConfig) -> Result<(), String> {
+    let (img, width, height);
+    match read_image(config.input_path) {
+        Ok(values) => {
+            img = values.0;
+            width = values.1;
+            height = values.2;
+        },
+        Err(msg) => return Err(msg),
+    }
+
+    let runner = Runner::new(RunnerConfig {
+        batch_size: 25600,
+        good_min_area: config.filter_speckle_area,
+        good_max_area: (width * height),
+        is_same_color_a: config.color_precision_loss,
+        is_same_color_b: 1,
+        deepen_diff: config.layer_difference,
+        hollow_neighbours: 1,
+    }, img);
+
+    let clusters = runner.run();
+
+    let view = clusters.view();
+
+    let mut svg = SvgFile::new(width, height);
+    for &cluster_index in view.clusters_output.iter().rev() {
+        let cluster = view.get_cluster(cluster_index);
+        let svg_path = cluster.to_svg_path(
+            &view,
+            false,
+            config.mode,
+            config.corner_threshold,
+            config.length_threshold,
+            config.max_iterations,
+            config.splice_threshold
+        );
+        svg.add_path(svg_path, cluster.residue_color());
+    }
+
+    let out_file = File::create(config.output_path);
+    let mut out_file = match out_file {
+        Ok(file) => file,
+        Err(_) => return Err(String::from("Cannot create output file.")),
+    };
+    
+    out_file.write_all(&svg.to_svg_file().as_bytes()).unwrap();
+
+    Ok(())
+}
+
+pub fn binary_image_to_svg(config: ConverterConfig) -> Result<(), String> {
+    
+    let (img, width, height);
+    match read_image(config.input_path) {
+        Ok(values) => {
+            img = values.0;
+            width = values.1;
+            height = values.2;
+        },
+        Err(msg) => return Err(msg),
+    }
+    let img = img.to_binary_image(|x| x.r < 128);
+
+    let clusters = img.to_clusters(false);
+    
+    let mut svg = SvgFile::new(width, height);
+    for i in 0..clusters.len() {
+        let cluster = clusters.get_cluster(i);
+        if cluster.size() >= config.filter_speckle_area {
+            let svg_path = cluster.to_svg_path(
+                config.mode,
+                config.corner_threshold,
+                config.length_threshold,
+                config.max_iterations,
+                config.splice_threshold,
+            );
+            let color = Color::color(&ColorName::Black);
+            svg.add_path(svg_path, color);
+        }
+    }
+
+    write_svg(svg, config.output_path)
+}
+
+fn read_image(input_path: PathBuf) -> Result<(ColorImage, usize, usize), String> {
+    let img = image::open(input_path);
+    let img = match img {
+        Ok(file) => file.to_rgba(),
+        Err(_) => return Err(String::from("No image file found at specified input path")),
+    };
+
+    let (width, height) = (img.width() as usize, img.height() as usize);
+    let img = ColorImage {pixels: img.as_raw().to_vec(), width, height};
+
+    Ok((img, width, height))
+}
+
+fn write_svg(svg: SvgFile, output_path: PathBuf) -> Result<(), String> {
+    let out_file = File::create(output_path);
+    let mut out_file = match out_file {
+        Ok(file) => file,
+        Err(_) => return Err(String::from("Cannot create output file.")),
+    };
+    
+    out_file.write_all(&svg.to_svg_file().as_bytes()).unwrap();
+
+    Ok(())
+}
\ No newline at end of file
diff --git a/cmdapp/src/lib.rs b/cmdapp/src/lib.rs
new file mode 100644
index 0000000..74a8e01
--- /dev/null
+++ b/cmdapp/src/lib.rs
@@ -0,0 +1,9 @@
+mod config;
+mod converter;
+mod svg;
+mod util;
+
+pub use config::*;
+pub use converter::*;
+pub use svg::*;
+pub use util::*;
\ No newline at end of file
diff --git a/cmdapp/src/main.rs b/cmdapp/src/main.rs
new file mode 100644
index 0000000..230d524
--- /dev/null
+++ b/cmdapp/src/main.rs
@@ -0,0 +1,14 @@
+use vtracer::{Config, convert_image_to_svg};
+
+fn main() {
+    let config = Config::from_args();
+    let result = convert_image_to_svg(config);
+    match result {
+        Ok(()) => {
+            println!("Conversion successful.");
+        },
+        Err(msg) => {
+            panic!("Conversion failed with error message: {}", msg);
+        }
+    }
+}
\ No newline at end of file
diff --git a/cmdapp/src/svg.rs b/cmdapp/src/svg.rs
new file mode 100644
index 0000000..7abccb1
--- /dev/null
+++ b/cmdapp/src/svg.rs
@@ -0,0 +1,43 @@
+use visioncortex::Color;
+
+pub struct SvgPath {
+    path: String,
+    color: Color,
+}
+
+pub struct SvgFile {
+    patches: Vec<SvgPath>,
+    width: usize,
+    height: usize,
+}
+
+impl SvgFile {
+    pub fn new(width: usize, height: usize) -> Self {
+        SvgFile {
+            patches: vec![],
+            width,
+            height,
+        }
+    }
+
+    pub fn add_path(&mut self, path: String, color: Color) {
+        self.patches.push(SvgPath {
+            path,
+            color
+        })
+    }
+
+    pub fn to_svg_file(&self) -> String {
+        let mut result: Vec<String> = vec![format!(r#"<?xml version="1.0" encoding="UTF-8"?>
+        <svg width="{}" height="{}">
+        "#, self.width, self.height)];
+
+        for patch in &self.patches {
+            let color = patch.color;
+            result.push(format!("<path d=\"{}\" fill=\"#{:02x}{:02x}{:02x}\"/>\n", patch.path, color.r, color.g, color.b));
+        };
+
+        result.push(String::from("</svg>"));
+        result.concat()
+    }
+}
\ No newline at end of file
diff --git a/cmdapp/src/util.rs b/cmdapp/src/util.rs
new file mode 100644
index 0000000..06034c1
--- /dev/null
+++ b/cmdapp/src/util.rs
@@ -0,0 +1,24 @@
+use visioncortex::PathSimplifyMode;
+use super::Preset;
+
+pub fn path_simplify_mode(s: &str) -> PathSimplifyMode {
+    match s {
+        "polygon" => PathSimplifyMode::Polygon,
+        "spline" => PathSimplifyMode::Spline,
+        "none" => PathSimplifyMode::None,
+        _ => panic!("unknown PathSimplifyMode {}", s),
+    }
+}
+
+pub fn preset(s: &str) -> Preset {
+    match s {
+        "bw" => Preset::Bw,
+        "poster" => Preset::Poster,
+        "photo" => Preset::Photo,
+        _ => panic!("unknown Preset {}", s),
+    }
+}
+
+pub fn deg2rad(deg: i32) -> f64 {
+    deg as f64 / 180.0 * std::f64::consts::PI
+}
\ No newline at end of file