diff --git a/src/main.rs b/src/main.rs
index f81422b..782491c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,7 +3,7 @@ extern crate clap;
 #[macro_use]
 extern crate colour;
 
-use clap::{App, SubCommand};
+use clap::{App, Arg, SubCommand};
 
 mod reskit;
 use reskit::utility;
@@ -19,6 +19,14 @@ fn main() {
                 .about( "Generate a Sega Megadrive VDP tileset + palette from a 15-colour image" )
                 .arg_from_usage( "-i, --input=<FILE> 'Specify input image'" )
                 .arg_from_usage( "-o, --output=<FILE> 'Specify output file'")
+                .arg(
+                    Arg::with_name( "FORMAT" )
+                        .short( "f" )
+                        .long( "format" )
+                        .help( "Specify output format for tileset (valid FORMAT options: bin, inc)")
+                        .default_value( "bin" )
+                        .takes_value( true )
+                )
         )
         .get_matches();
 
@@ -27,7 +35,7 @@ fn main() {
         // Get input and output filenames
         if let Some( input_filename ) = matches.value_of( "input" ) {
             if let Some( output_filename ) = matches.value_of( "output" ) {
-                return tileset::generate( input_filename, output_filename );
+                return tileset::generate( input_filename, output_filename, matches.value_of( "FORMAT" ).unwrap() );
             } else {
                 utility::print_error( "expected: output_filename (-o,--output)" );
             }
diff --git a/src/reskit/tileset.rs b/src/reskit/tileset.rs
index 12980ed..ffc5179 100644
--- a/src/reskit/tileset.rs
+++ b/src/reskit/tileset.rs
@@ -40,7 +40,26 @@ fn get_pixel( image: &DynamicImage, palette: &mut [u16; 16], x: u32, y: u32 ) ->
 	color_to_palette( pixel[ 0 ].into(), pixel[ 1 ].into(), pixel[ 2 ].into(), palette )
 }
 
-pub fn generate( image_filename: &str, output_filename: &str ) {
+fn output_bin( image_filename: &str, output_filename: &str, palette: [u16; 16], body: Vec<u8> ) {
+	let mut output_palette: Vec< u8 > = Vec::new();
+	for i in 0..palette.len() {
+		let bytes = palette[ i ].to_be_bytes();
+		for i in 0..2 {
+			output_palette.push( bytes[ i ] );
+		}
+	}
+
+	let output_try = File::create( output_filename );
+	if let Ok( mut output_file ) = output_try {
+		output_file.write( &output_palette ).unwrap();
+		output_file.write( &body ).unwrap();
+		utility::print_good( format!( "converted file {}", image_filename ).as_str() );
+	} else {
+		utility::print_error( format!( "could not open filename for output {}", output_filename ).as_str() );
+	}
+}
+
+pub fn generate( image_filename: &str, output_filename: &str, output_mode: &str ) {
 	let img = image::open( image_filename );
 	if let Ok( img ) = img {
 		let ( mut max_x, mut max_y ) = img.dimensions();
@@ -68,21 +87,10 @@ pub fn generate( image_filename: &str, output_filename: &str ) {
 			}
 		}
 
-		let mut output_palette: Vec< u8 > = Vec::new();
-		for i in 0..palette.len() {
-			let bytes = palette[ i ].to_be_bytes();
-			for i in 0..2 {
-				output_palette.push( bytes[ i ] );
-			}
-		}
-
-		let output_try = File::create( output_filename );
-		if let Ok( mut output_file ) = output_try {
-			output_file.write( &output_palette ).unwrap();
-			output_file.write( &body ).unwrap();
-			utility::print_good( format!( "converted file {}", image_filename ).as_str() );
+		if output_mode == "bin" {
+			output_bin( image_filename, output_filename, palette, body );
 		} else {
-			utility::print_error( format!( "could not open filename for output {}", output_filename ).as_str() );
+			utility::print_error( format!( "invalid output mode {}", output_mode ).as_str() );
 		}
 	} else {
 		utility::print_error( format!( "could not open filename {}", image_filename ).as_str() );