diff --git a/.gitignore b/.gitignore
index 55d94da..249bc38 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 /target
 *.lock
-bmp/out.bmp
+bmp/out.*
diff --git a/Cargo.toml b/Cargo.toml
index 42856bd..704f945 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,3 +14,7 @@ image = "0.24.9"
 anyhow = "1.0.86"
 bingus = { version = "0.1.0", path = "bingus" }
 num-traits = "0.2.19"
+dasp_sample = "0.11.0"
+rayon = "1.10.0"
+dirs = "5.0.1"
+rfd = "0.14.1"
diff --git a/bent-funny-zone/Cargo.toml b/bent-funny-zone/Cargo.toml
index ccc2cda..6306660 100644
--- a/bent-funny-zone/Cargo.toml
+++ b/bent-funny-zone/Cargo.toml
@@ -15,3 +15,9 @@ image = { workspace = true }
 fundsp = { workspace = true }
 anyhow = { workspace = true }
 bingus = { workspace = true }
+dasp_sample = { workspace = true }
+rayon = { workspace = true }
+dirs = { workspace = true }
+rfd = { workspace = true }
+derive-new = "0.6.0"
+indicatif = { version = "0.17.8", features = ["rayon"] }
diff --git a/bent-funny-zone/src/main.rs b/bent-funny-zone/src/main.rs
index 16427a5..e04dc8b 100644
--- a/bent-funny-zone/src/main.rs
+++ b/bent-funny-zone/src/main.rs
@@ -1,27 +1,102 @@
-use std::array;
+use std::path::PathBuf;
 
-use anyhow::Result;
-use fundsp::{
-    hacker::{bell_hz, pipei, U12},
-    math::db_amp,
-};
-use image::io::Reader as ImageReader;
+use anyhow::{Context, Result};
+use dasp_sample::{Sample, U24};
+use derive_new::new;
+use dirs::{download_dir, home_dir, picture_dir};
+use fundsp::math::uparc;
+use image::{io::Reader as ImageReader, ImageBuffer, ImageFormat, Rgb};
+use indicatif::{ParallelProgressIterator, ProgressStyle};
+use rayon::{iter::ParallelIterator, slice::ParallelSlice};
+use rfd::FileDialog;
+
+struct Files {
+    input: PathBuf,
+    output: PathBuf,
+}
+
+#[derive(new)]
+struct DataPath {
+    files: Files,
+}
+
+impl Files {
+    fn try_new(input: PathBuf, output: PathBuf) -> Result<Self> {
+        Ok(Files {
+            input: Self::verify_image_file(input, "input")?,
+            output: Self::verify_image_file(output, "output")?,
+        })
+    }
+    fn verify_image_file(path: PathBuf, label: &'static str) -> Result<PathBuf> {
+        ImageFormat::from_path(&path).with_context(|| {
+            format!("your {label} image must have a supported extension from this list:")
+                + &ImageFormat::all()
+                    .map(|format| {
+                        format!(
+                            "\n\t{:?} ({})",
+                            format,
+                            format
+                                .extensions_str()
+                                .iter()
+                                .fold(String::new(), |acc, x| acc + &format!(".{x}, "))
+                                .strip_suffix(", ")
+                                .unwrap()
+                        )
+                    })
+                    .reduce(|acc, x| acc + &x)
+                    .unwrap()
+        })?;
+        Ok(path)
+    }
+    fn prompt() -> Result<Self> {
+        Files::try_new(
+            FileDialog::new()
+                .set_title("Input image")
+                .set_directory(working_dir())
+                .pick_file()
+                .context("no input image selected")?,
+            FileDialog::new()
+                .set_title("Output image")
+                .set_directory(working_dir())
+                .save_file()
+                .context("no output filename provided")?,
+        )
+    }
+}
 
 fn main() -> Result<()> {
-    let mut img = ImageReader::open("bmp/bigsample.bmp")?.decode()?.to_rgb8();
-    let mut equalizer =
-        pipei::<U12, _, _>(|i| bell_hz(1000.0 + 1000.0 * i as f32, 1.0, db_amp(0.0)));
-    img.to_vec()
-        .chunks_exact(3)
-        .map(|px: &[u8]| f32::from_ne_bytes(array::from_fn(|i| px[i % px.len()])))
-        .map(|x| equalizer.filter_mono(x))
-        .flat_map(|px| -> [u8; 3] {
-            let px = px.to_ne_bytes();
-            array::from_fn(move |i| px[i])
-        })
-        .zip(img.as_mut())
-        .for_each(|(filtered, original)| *original = filtered);
-    img.save("bmp/out.bmp")?;
+    let dp = DataPath::new(Files::prompt()?);
+    let img = ImageReader::open(dp.files.input)?
+        .decode()
+        .context("can't use this picture")?
+        .to_rgb8();
+    let (width, height) = (img.width(), img.height());
+    let processed: ImageBuffer<Rgb<u8>, Vec<u8>> = ImageBuffer::from_raw(
+        width,
+        height,
+        img.into_raw()
+            .par_chunks_exact(3)
+            .progress_count((width * height).into())
+            .with_style(ProgressStyle::with_template(
+                "[{eta}] {bar:40.green/red} {pos}/{len} pixels",
+            )?)
+            .map(|px: &[u8]| (px[2] as i32) | ((px[1] as i32) << 8) | ((px[0] as i32) << 16))
+            .map(|px| U24::new_unchecked(px))
+            .map(|x| uparc(x.to_sample()))
+            .flat_map(|sample: f32| {
+                let rgb: U24 = sample.to_sample();
+                let rgo = ((rgb) >> 8.into()) << 8.into();
+                let roo = ((rgo) >> 16.into()) << 16.into();
+                [
+                    ((roo) >> 16.into()).inner() as u8,
+                    ((rgo - roo) >> 8.into()).inner() as u8,
+                    (rgb - rgo).inner() as u8,
+                ]
+            })
+            .collect(),
+    )
+    .unwrap();
+    processed.save(dp.files.output)?;
 
     // let bytes: Vec<u8> = (1u8..7).into_iter().collect();
     // assert_eq!(
@@ -37,3 +112,10 @@ fn main() -> Result<()> {
     // );
     Ok(())
 }
+
+fn working_dir() -> PathBuf {
+    picture_dir()
+        .or(download_dir())
+        .or(home_dir())
+        .unwrap_or("/".into())
+}