diff --git a/src/affine.rs b/src/affine.rs
index 15e25f6..f7bfadd 100644
--- a/src/affine.rs
+++ b/src/affine.rs
@@ -1,5 +1,5 @@
 //! Manages the affine image transformations.
-use std::ops::{Deref, DerefMut};
+use std::ops::DerefMut;
 
 use crate::{cloner::ImageCloner, Image};
 
@@ -45,7 +45,7 @@ impl<const CHANNELS: usize> ImageCloner<'_, CHANNELS> {
     }
 }
 
-impl<const CHANNELS: usize, T: Deref<Target = [u8]> + DerefMut<Target = [u8]>> Image<T, CHANNELS> {
+impl<const CHANNELS: usize, T: DerefMut<Target = [u8]>> Image<T, CHANNELS> {
     /// Flip an image vertically.
     pub fn flip_v(&mut self) {
         for y in 0..self.height() / 2 {
@@ -131,7 +131,7 @@ impl<const CHANNELS: usize> ImageCloner<'_, CHANNELS> {
     }
 }
 
-impl<const CHANNELS: usize, T: Deref<Target = [u8]> + DerefMut<Target = [u8]>> Image<T, CHANNELS> {
+impl<const CHANNELS: usize, T: DerefMut<Target = [u8]>> Image<T, CHANNELS> {
     /// Rotate an image 180 degrees clockwise.
     pub fn rot_180(&mut self) {
         self.flatten_mut().reverse();
@@ -166,7 +166,7 @@ impl<const CHANNELS: usize, T: Deref<Target = [u8]> + DerefMut<Target = [u8]>> I
 /// # Safety
 ///
 /// UB if supplied image rectangular
-unsafe fn transpose<const CHANNELS: usize, T: Deref<Target = [u8]> + DerefMut<Target = [u8]>>(
+unsafe fn transpose<const CHANNELS: usize, T: DerefMut<Target = [u8]>>(
     img: &mut Image<T, CHANNELS>,
 ) {
     debug_assert_eq!(img.width(), img.height());
@@ -184,10 +184,7 @@ unsafe fn transpose<const CHANNELS: usize, T: Deref<Target = [u8]> + DerefMut<Ta
 /// # Safety
 ///
 /// UB if image not square
-unsafe fn transpose_non_power_of_two<
-    const CHANNELS: usize,
-    T: Deref<Target = [u8]> + DerefMut<Target = [u8]>,
->(
+unsafe fn transpose_non_power_of_two<const CHANNELS: usize, T: DerefMut<Target = [u8]>>(
     img: &mut Image<T, CHANNELS>,
 ) {
     debug_assert_eq!(img.width(), img.height());
@@ -208,10 +205,7 @@ const TILE: usize = 4;
 /// # Safety
 ///
 /// be careful
-unsafe fn transpose_tile<
-    const CHANNELS: usize,
-    T: Deref<Target = [u8]> + DerefMut<Target = [u8]>,
->(
+unsafe fn transpose_tile<const CHANNELS: usize, T: DerefMut<Target = [u8]>>(
     img: &mut Image<T, CHANNELS>,
     row: usize,
     col: usize,
@@ -247,10 +241,7 @@ unsafe fn transpose_tile<
 /// # Safety
 ///
 /// be careful
-unsafe fn transpose_diag<
-    const CHANNELS: usize,
-    T: Deref<Target = [u8]> + DerefMut<Target = [u8]>,
->(
+unsafe fn transpose_diag<const CHANNELS: usize, T: DerefMut<Target = [u8]>>(
     img: &mut Image<T, CHANNELS>,
     pos: usize,
     size: usize,
diff --git a/src/drawing/box.rs b/src/drawing/box.rs
index 4893bae..ff85f0f 100644
--- a/src/drawing/box.rs
+++ b/src/drawing/box.rs
@@ -1,9 +1,9 @@
 //! `Box<cat>`
-use std::ops::{Deref, DerefMut, Range};
+use std::ops::{DerefMut, Range};
 
 use crate::Image;
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
+impl<T: DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
     /// Draw a bordered box
     /// ```
     /// # use fimg::Image;
diff --git a/src/drawing/line.rs b/src/drawing/line.rs
index 195d312..fd2b33d 100644
--- a/src/drawing/line.rs
+++ b/src/drawing/line.rs
@@ -1,10 +1,7 @@
 //! adds a `line` function to Image
 #![allow(clippy::missing_docs_in_private_items)]
 use crate::Image;
-use std::{
-    iter::Iterator,
-    ops::{Deref, DerefMut},
-};
+use std::{iter::Iterator, ops::DerefMut};
 
 /// taken from [bresenham-rs](https://github.com/mbr/bresenham-rs)
 pub struct Bresenham {
@@ -130,7 +127,7 @@ impl Iterator for Bresenham {
     }
 }
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
+impl<T: DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
     /// Draw a line from point a to point b.
     ///
     /// Points not in bounds will not be included.
diff --git a/src/drawing/poly.rs b/src/drawing/poly.rs
index aa86168..0799457 100644
--- a/src/drawing/poly.rs
+++ b/src/drawing/poly.rs
@@ -1,12 +1,12 @@
 //! draw polygons
 use std::{
     cmp::{max, min},
-    ops::{Deref, DerefMut},
+    ops::DerefMut,
 };
 
 use crate::Image;
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
+impl<T: DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
     /// Draws a filled polygon from a slice of points. Please close your poly. (first == last)
     ///
     /// Borrowed from [imageproc](https://docs.rs/imageproc/latest/src/imageproc/drawing/polygon.rs.html#31), modified for less allocations.
diff --git a/src/drawing/tri.rs b/src/drawing/tri.rs
index c4d2d6c..e141f94 100644
--- a/src/drawing/tri.rs
+++ b/src/drawing/tri.rs
@@ -1,9 +1,9 @@
 //! trongle drawing
-use std::ops::{Deref, DerefMut};
+use std::ops::DerefMut;
 
 use crate::Image;
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
+impl<T: DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
     /// Draw a (filled) triangle
     /// ```
     /// # use fimg::*;
diff --git a/src/overlay.rs b/src/overlay.rs
index 4165399..06b6c79 100644
--- a/src/overlay.rs
+++ b/src/overlay.rs
@@ -100,9 +100,7 @@ unsafe fn blit(rgb: &mut [u8], rgba: &[u8]) {
     }
 }
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, U: Deref<Target = [u8]>>
-    Overlay<Image<U, 4>> for Image<T, 4>
-{
+impl<T: DerefMut<Target = [u8]>, U: Deref<Target = [u8]>> Overlay<Image<U, 4>> for Image<T, 4> {
     #[inline]
     unsafe fn overlay(&mut self, with: &Image<U, 4>) -> &mut Self {
         debug_assert!(self.width() == with.width());
@@ -129,9 +127,7 @@ impl ClonerOverlay<4, 4> for ImageCloner<'_, 4> {
     }
 }
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, U: Deref<Target = [u8]>>
-    OverlayAt<Image<U, 4>> for Image<T, 3>
-{
+impl<T: DerefMut<Target = [u8]>, U: Deref<Target = [u8]>> OverlayAt<Image<U, 4>> for Image<T, 3> {
     #[inline]
     unsafe fn overlay_at(&mut self, with: &Image<U, 4>, x: u32, y: u32) -> &mut Self {
         // SAFETY: caller upholds this
@@ -167,9 +163,7 @@ impl ClonerOverlayAt<4, 3> for ImageCloner<'_, 3> {
     }
 }
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, U: Deref<Target = [u8]>>
-    OverlayAt<Image<U, 3>> for Image<T, 3>
-{
+impl<T: DerefMut<Target = [u8]>, U: Deref<Target = [u8]>> OverlayAt<Image<U, 3>> for Image<T, 3> {
     /// Overlay a RGB image(with) => self at coordinates x, y.
     /// As this is a `RGBxRGB` operation, blending is unnecessary,
     /// and this is simply a copy.
@@ -208,9 +202,7 @@ impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, U: Deref<Target = [u8]>>
     }
 }
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, U: Deref<Target = [u8]>>
-    Overlay<Image<U, 4>> for Image<T, 3>
-{
+impl<T: DerefMut<Target = [u8]>, U: Deref<Target = [u8]>> Overlay<Image<U, 4>> for Image<T, 3> {
     #[inline]
     unsafe fn overlay(&mut self, with: &Image<U, 4>) -> &mut Self {
         debug_assert!(self.width() == with.width());
@@ -244,9 +236,7 @@ impl ClonerOverlay<4, 3> for ImageCloner<'_, 3> {
     }
 }
 
-impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, U: Deref<Target = [u8]>>
-    OverlayAt<Image<U, 4>> for Image<T, 4>
-{
+impl<T: DerefMut<Target = [u8]>, U: Deref<Target = [u8]>> OverlayAt<Image<U, 4>> for Image<T, 4> {
     #[inline]
     /// Overlay with => self at coordinates x, y, without blending
     ///