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-checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
-dependencies = [
- "autocfg",
+ "pkg-config",
 ]
 
 [[package]]
@@ -635,44 +89,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "once_cell"
-version = "1.21.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "bitflags",
- "crc32fast",
- "fdeflate",
- "flate2",
- "miniz_oxide",
-]
-
-[[package]]
-name = "ppv-lite86"
-version = "0.2.21"
+name = "pkg-config"
+version = "0.3.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
-dependencies = [
- "zerocopy",
-]
+checksum = "7edddbd0b52d732b21ad9a5fab5c704c14cd949e5e9a1ec5929a24fded1b904c"
 
 [[package]]
 name = "proc-macro2"
@@ -684,49 +104,6 @@ dependencies = [
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 [[package]]
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- "num-traits",
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-
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@@ -736,135 +113,12 @@ dependencies = [
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- "rand_core",
-]
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- "rand_core",
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- "arbitrary",
- "arg_enum_proc_macro",
- "arrayvec",
- "av-scenechange",
- "av1-grain",
- "bitstream-io",
- "built",
- "cfg-if",
- "interpolate_name",
- "itertools",
- "libc",
- "libfuzzer-sys",
- "log",
- "maybe-rayon",
- "new_debug_unreachable",
- "noop_proc_macro",
- "num-derive",
- "num-traits",
- "paste",
- "profiling",
- "rand",
- "rand_chacha",
- "simd_helpers",
- "thiserror",
- "v_frame",
- "wasm-bindgen",
-]
-
-[[package]]
-name = "ravif"
-version = "0.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef69c1990ceef18a116855938e74793a5f7496ee907562bd0857b6ac734ab285"
-dependencies = [
- "avif-serialize",
- "imgref",
- "loop9",
- "quick-error",
- "rav1e",
- "rayon",
- "rgb",
-]
-
-[[package]]
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-dependencies = [
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- "rayon-core",
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-
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-dependencies = [
- "crossbeam-deque",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "rgb"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c6a884d2998352bb4daf0183589aec883f16a6da1f4dde84d8e2e9a5409a1ce"
-
-[[package]]
-name = "rustversion"
-version = "1.0.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
-
-[[package]]
 name = "ryu"
 version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
 
 [[package]]
-name = "scopeguard"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
-
-[[package]]
 name = "serde"
 version = "1.0.193"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -904,27 +158,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d66dc143e6b11c1eddc06d5c423cfc97062865baf299914ab64caa38182078fe"
 
 [[package]]
-name = "simd_helpers"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95890f873bec569a0362c235787f3aca6e1e887302ba4840839bcc6459c42da6"
-dependencies = [
- "quote",
-]
-
-[[package]]
-name = "smallvec"
-version = "1.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4dccd0940a2dcdf68d092b8cbab7dc0ad8fa938bf95787e1b916b0e3d0e8e970"
-
-[[package]]
-name = "stable_deref_trait"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
-
-[[package]]
 name = "syn"
 version = "2.0.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -936,26 +169,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "thiserror"
-version = "2.0.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f63587ca0f12b72a0600bcba1d40081f830876000bb46dd2337a3051618f4fc8"
-dependencies = [
- "thiserror-impl",
-]
-
-[[package]]
-name = "thiserror-impl"
-version = "2.0.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ff15c8ecd7de3849db632e14d18d2571fa09dfc5ed93479bc4485c7a517c913"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
 name = "threadpool"
 version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -965,29 +178,17 @@ dependencies = [
 ]
 
 [[package]]
-name = "tiff"
-version = "0.10.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af9605de7fee8d9551863fd692cce7637f548dbd9db9180fcc07ccc6d26c336f"
-dependencies = [
- "fax",
- "flate2",
- "half",
- "quick-error",
- "weezl",
- "zune-jpeg 0.4.21",
-]
-
-[[package]]
 name = "tikz_gallery_generator"
 version = "1.0.0"
 dependencies = [
- "image",
+ "libwebp-sys",
  "num_cpus",
  "serde",
  "serde_yaml",
  "threadpool",
- "webp",
+ "zune-core",
+ "zune-jpeg",
+ "zune-png",
 ]
 
 [[package]]
@@ -1003,129 +204,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f28467d3e1d3c6586d8f25fa243f544f5800fec42d97032474e17222c2b75cfa"
 
 [[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "aligned-vec",
- "num-traits",
- "wasm-bindgen",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0562428422c63773dad2c345a1882263bbf4d65cf3f42e90921f787ef5ad58e7"
-dependencies = [
- "wit-bindgen",
-]
-
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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- "once_cell",
- "rustversion",
- "wasm-bindgen-macro",
- "wasm-bindgen-shared",
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-
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-
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-dependencies = [
- "zerocopy-derive",
-]
-
-[[package]]
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-checksum = "2c7962b26b0a8685668b671ee4b54d007a67d4eaf05fda79ac0ecf41e32270f1"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f423a2c17029964870cfaabb1f13dfab7d092a62a29a89264f4d36990ca414a"
-
-[[package]]
 name = "zune-core"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "111f7d9820f05fd715df3144e254d6fc02ee4088b0644c0ffd0efc9e6d9d2773"
+checksum = "cb8a0807f7c01457d0379ba880ba6322660448ddebc890ce29bb64da71fb40f9"
 
 [[package]]
 name = "zune-inflate"
@@ -1138,18 +220,19 @@ dependencies = [
 
 [[package]]
 name = "zune-jpeg"
-version = "0.4.21"
+version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29ce2c8a9384ad323cf564b67da86e21d3cfdff87908bc1223ed5c99bc792713"
+checksum = "e35aee689668bf9bd6f6f3a6c60bb29ba1244b3b43adfd50edd554a371da37d5"
 dependencies = [
- "zune-core 0.4.12",
+ "zune-core",
 ]
 
 [[package]]
-name = "zune-jpeg"
-version = "0.5.8"
+name = "zune-png"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e35aee689668bf9bd6f6f3a6c60bb29ba1244b3b43adfd50edd554a371da37d5"
+checksum = "af6dc406edc296451b9597ee98643df8606396066d8f0864682c266eda16f310"
 dependencies = [
- "zune-core 0.5.0",
+ "zune-core",
+ "zune-inflate",
 ]

diff --git a/Cargo.toml b/Cargo.toml
@@ -9,8 +9,10 @@ license = "GPLv3"
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
 serde_yaml = "0.9"
-webp = "0.3"
-image = "0.25"
+libwebp-sys = "0.14"
+zune-core = "0.5"
+zune-jpeg = "0.5"
+zune-png = "0.5"
 threadpool = "1.8.1"
 num_cpus = "1.16.0"
 

diff --git /dev/null b/src/image.rs
@@ -0,0 +1,373 @@
+//! Efficient-ish routines for parsing JPEG/PNG and encoding WebP
+//!
+//! We avoid using the `image` crate because it is bloated, yet we do use some
+//! libraries:
+//!
+//! * `libwebp-sys` (we don't use `webp` because it requires `image`
+//! * `zune-jpeg`   (used internaly by `image`)
+//! * `zune-png`
+//!
+//! The `zune-` crates implement SIMD optimizations.
+//!
+//! Working with these crates directly also allows us the oportunity to
+//! streamline pixel format conversions. For example, when parsing JPEG we now
+//! feed the YUV pixel data directly to `libwebp` instead of first converting
+//! it to RGB and then converting it back to YUV (which is what `image` would
+//! have done).
+
+use std::{
+  slice,
+  ptr,
+  io::{self, Write, Read, BufReader},
+  path::Path,
+  fs::File,
+};
+use zune_core::{
+  colorspace::ColorSpace,
+  options::DecoderOptions,
+  bytestream::ZCursor,
+  result::DecodingResult,
+};
+use zune_jpeg::JpegDecoder;
+use zune_png::PngDecoder;
+use libwebp_sys::WebPEncodingError;
+
+use crate::create_file;
+
+#[derive(Clone, Debug)]
+pub struct Image {
+  pixels: PixelBuffer,
+  pub width:  u32,
+  pub height: u32,
+}
+
+#[derive(Clone, Debug)]
+enum PixelBuffer {
+  Yuv { y: Vec<u8>, u: Vec<u8>, v: Vec<u8>, uv_stride: u32, },
+  Grayscale { level: Vec<u8>, alpha: Option<Vec<u8>>, },
+  Rgb(Vec<u8>),
+  Rgba(Vec<u8>),
+}
+
+pub fn parse_jpeg(path: &Path) -> Result<Image, ()> {
+  let options = DecoderOptions::default()
+    .jpeg_set_out_colorspace(ColorSpace::YCbCr);
+
+  let f = BufReader::new(open_file(path).map_err(|_| ())?);
+  let mut decoder = JpegDecoder::new_with_options(f, options);
+
+  let pixels = match decoder.decode() {
+    Ok(pixels) => pixels,
+    Err(e)     => {
+      errorln!("Couldn't parse {path:?}: {e}");
+      return Err(());
+    }
+  };
+
+  let info = decoder.info().expect("should have already parsed JPEG header");
+
+  let options = decoder.options();
+
+  let width  = info.width  as u32;
+  let height = info.height as u32;
+  let uv_width  = width.div_ceil(2);
+  let uv_height = height.div_ceil(2);
+
+  assert_expected_pixels_len(
+    width as usize,
+    height as usize,
+    3,
+    pixels.len()
+  );
+  let y_len:  usize = (width * height) as _;
+  let uv_len: usize = (uv_width * uv_height) as _;
+
+  let colorspace = options.jpeg_get_out_colorspace();
+  debug_assert!(colorspace == ColorSpace::YCbCr,
+                "unexpected colorspace when parsing JPEG: {colorspace:?}");
+
+  let mut y = vec![0; y_len];
+  let mut u = vec![0; uv_len];
+  let mut v = vec![0; uv_len];
+
+  // TODO: [optmize]: can we optimize these loops?
+  for i in 0..y_len { y[i] = pixels[i*3]; }
+  for uv_x in 0..uv_width {
+    for uv_y in 0..uv_height {
+      let x = uv_x * 2;
+      let y = uv_y * 2;
+
+      let i: usize = (y * width + x) as _;
+      let j: usize = (uv_y * uv_width + uv_x) as _;
+
+      // NOTE: using an approximation of nearest neighbor for efficient
+      let u_val = pixels[i*3+1];
+      let v_val = pixels[i*3+2];
+      u[j] = u_val;
+      v[j] = v_val;
+    }
+  }
+
+  Ok(Image {
+    pixels: PixelBuffer::Yuv { y, u, v, uv_stride: uv_width, },
+    width,
+    height,
+  })
+}
+
+pub fn parse_png(path: &Path) -> Result<Image, ()> {
+  let options = DecoderOptions::default()
+    .png_set_strip_to_8bit(true);
+
+  let mut f = open_file(path).map_err(|_| ())?;
+  let size: usize = f.metadata()
+    .expect("OS should support file metadata")
+    .len() as _;
+  let mut f_contents = Vec::with_capacity(size);
+  f.read_to_end(&mut f_contents)
+    .map_err(|e| errorln!("Could not read {path:?}: {e}"))?;
+  let f_contents = ZCursor::new(f_contents);
+
+  let mut decoder = PngDecoder::new_with_options(f_contents, options);
+
+  let pixels = match decoder.decode() {
+    Ok(DecodingResult::U8(pixels)) => pixels,
+    Ok(DecodingResult::U16(_)) => {
+      unreachable!("PNG strip was set to 8 bits")
+    }
+    Ok(_) => {
+      unreachable!("PngDecoder::decode should always return DecodingResult::U8 or DecodingResult::U16")
+    }
+    Err(e) => {
+      errorln!("Couldn't parse {path:?}: {e}");
+      return Err(());
+    }
+  };
+
+  let (width, height) = decoder
+    .dimensions()
+    .expect("should already have decoded PNG headers");
+  let colorspace = decoder
+    .colorspace()
+    .expect("should already have decoded PNG headers");
+
+  match colorspace {
+    ColorSpace::RGB => {
+      assert_expected_pixels_len(width, height, 3, pixels.len());
+
+      Ok(Image {
+        pixels: PixelBuffer::Rgb(pixels),
+        width:  width  as u32,
+        height: height as u32,
+      })
+    }
+    ColorSpace::RGBA => {
+      assert_expected_pixels_len(width, height, 4, pixels.len());
+
+      Ok(Image {
+        pixels: PixelBuffer::Rgba(pixels),
+        width:  width  as u32,
+        height: height as u32,
+      })
+    }
+    ColorSpace::Luma => {
+      assert_expected_pixels_len(width, height, 1, pixels.len());
+
+      Ok(Image {
+        pixels: PixelBuffer::Grayscale { level: pixels, alpha: None, },
+        width:  width  as u32,
+        height: height as u32,
+      })
+    }
+    ColorSpace::LumaA => {
+      assert_expected_pixels_len(width, height, 2, pixels.len());
+
+      let len = pixels.len()/2;
+      let mut level = vec![0; len];
+      let mut alpha = vec![0; len];
+
+      #[allow(clippy::identity_op)]
+      for i in 0..len {
+        level[i] = pixels[i*2+0];
+        alpha[i] = pixels[i*2+1];
+      }
+
+      Ok(Image {
+        pixels: PixelBuffer::Grayscale { level, alpha: Some(alpha), },
+        width:  width  as u32,
+        height: height as u32,
+      })
+    }
+    colorspace => {
+      unreachable!("unexpected colorspace when parsing PNG: {colorspace:?}")
+    }
+  }
+}
+
+pub fn encode_webp(img: &Image, output_path: &Path) -> Result<(), ()> {
+  use std::mem::MaybeUninit;
+  use libwebp_sys::*;
+  const WEBP_IMAGE_QUALITY: f32 = 90.0;
+
+  unsafe {
+    // ======================================================================
+    let mut config = MaybeUninit::uninit();
+    let init = WebPInitConfig(config.as_mut_ptr());
+    let mut config: WebPConfig = config.assume_init();
+    debug_assert!(init, "libwebp version mismatch");
+
+    config.lossless          = 0; // using lossy compression
+    config.alpha_compression = 1; // using lossy compression
+    config.quality           = WEBP_IMAGE_QUALITY;
+
+    debug_assert!(WebPValidateConfig(&config) != 0,
+                  "WebP config should be valid");
+
+    // ======================================================================
+    // NOTE: it makes no sense to re-use ww because WebPMemoryWriterClear(ww)
+    //       literally frees ww.mem and sets it NULL
+    let mut ww = MaybeUninit::uninit();
+    WebPMemoryWriterInit(ww.as_mut_ptr());
+    let mut ww: WebPMemoryWriter = ww.assume_init();
+
+    // NOTE: we cannot re-use picture because WebPPictureAlloc,
+    //       WebPPictureImportRGB & WebPPictureImportRGBA all free the pixel
+    //       buffers before reallocating them
+    let mut picture = MaybeUninit::uninit();
+    let init = WebPPictureInit(picture.as_mut_ptr());
+    let mut picture: WebPPicture = picture.assume_init();
+    debug_assert!(init, "libwebp version mismatch");
+
+    // NOTE: the libwebp documentation recommends using YUV (which is the
+    //       default in WebPPictureInit) when doing lossy compression
+    // picture.use_argb = 0;
+    picture.width  = img.width  as i32;
+    picture.height = img.height as i32;
+    let import_status = match &img.pixels {
+      PixelBuffer::Yuv { y, u, v, uv_stride, } => {
+        // NOTE: setting picture.y, picture.u & picture.v manually to avoid
+        //       recopying the pixel buffers
+        //
+        //       we must indicate picture is a "view" (i.e. does not own the
+        //       pixel buffer memory) by setting picture.memory_ to NULL:
+        //       libwebp/src/enc/picture_rescale_enc.c:97
+        picture.memory_   = ptr::null_mut();
+        picture.y_stride  = img.width  as i32;
+        picture.uv_stride = *uv_stride as i32;
+        picture.y = y.as_ptr() as *mut _;
+        picture.u = u.as_ptr() as *mut _;
+        picture.v = v.as_ptr() as *mut _;
+
+        debug_assert!(WebPPictureIsView(&picture) != 0,
+                      "picture should have been configured as \"view\"");
+        true
+      }
+      PixelBuffer::Grayscale { level, alpha, } => {
+        if alpha.is_some() { picture.colorspace = WebPEncCSP::WEBP_YUV420A; }
+        let status = WebPPictureAlloc(&mut picture) != 0;
+        if status {
+          let uv_width:  usize = img.width.div_ceil(2)  as _;
+          let uv_height: usize = img.height.div_ceil(2) as _;
+          let uv_len = uv_width * uv_height;
+
+          ptr::copy_nonoverlapping(level.as_ptr(), picture.y, level.len());
+          ptr::write_bytes(picture.u, 128, uv_len);
+          ptr::write_bytes(picture.v, 128, uv_len);
+          if let Some(alpha) = alpha {
+            ptr::copy_nonoverlapping(alpha.as_ptr(), picture.a, alpha.len());
+          }
+        }
+
+        status
+      }
+      PixelBuffer::Rgb(pixels) => {
+        WebPPictureImportRGB(
+          &mut picture,
+          pixels.as_ptr(),
+          img.width as i32 * 3,
+        ) != 0
+      }
+      PixelBuffer::Rgba(pixels) => {
+        WebPPictureImportRGBA(
+          &mut picture,
+          pixels.as_ptr(),
+          img.width as i32 * 4,
+        ) != 0
+      }
+    };
+    if !import_status {
+      log_webp_memmory_error(picture.error_code, output_path);
+      return Err(());
+    }
+    picture.writer = Some(WebPMemoryWrite);
+    picture.custom_ptr = &mut ww as *mut WebPMemoryWriter as _;
+
+    // ======================================================================
+    let status = WebPEncode(&config, &mut picture) != 0;
+
+    let bytes = if status {
+      slice::from_raw_parts(ww.mem, ww.size)
+    } else {
+      log_webp_memmory_error(picture.error_code, output_path);
+      return Err(());
+    };
+
+    // ======================================================================
+    let mut thumb_file = create_file(output_path).map_err(|_| ())?;
+    if let Err(e) = thumb_file.write_all(bytes) {
+      errorln!("Couldn't write thumnail to file {output_path:?}: {e}");
+      return Err(());
+    }
+
+    WebPPictureFree(&mut picture);
+  }
+
+  Ok(())
+}
+
+#[inline]
+fn assert_expected_pixels_len(
+  width: usize,
+  height: usize,
+  bpp: usize,
+  pixels_len: usize,
+) {
+  let expected_pixels_len = width * height * bpp;
+  debug_assert!(
+    pixels_len == expected_pixels_len,
+    "unexpected pixel buffer length: expected {width} × {height} × {bpp} = {expected_pixels_len} but got {pixels_len}",
+  );
+}
+
+#[inline]
+fn log_webp_memmory_error(e: WebPEncodingError, output_path: &Path) {
+  match e {
+    WebPEncodingError::VP8_ENC_ERROR_OUT_OF_MEMORY => {
+      errorln!("Could not generate {output_path:?}: out of memmory");
+    }
+    WebPEncodingError::VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY => {
+      errorln!("Could not generate {output_path:?}: memory error while flushing bits");
+    }
+    WebPEncodingError::VP8_ENC_ERROR_PARTITION0_OVERFLOW => {
+      errorln!("Could not generate {output_path:?}: partition is bigger than 512k");
+    }
+    WebPEncodingError::VP8_ENC_ERROR_PARTITION_OVERFLOW => {
+      errorln!("Could not generate {output_path:?}: partition is bigger than 16M");
+    }
+    WebPEncodingError::VP8_ENC_ERROR_BAD_WRITE => {
+      errorln!("Could not generate {output_path:?}: error while flushing bytes");
+    }
+    WebPEncodingError::VP8_ENC_ERROR_FILE_TOO_BIG => {
+      errorln!("Could not generate {output_path:?}: file is bigger than 4G");
+    }
+    WebPEncodingError::VP8_ENC_ERROR_USER_ABORT => {
+      errorln!("Could not generate {output_path:?}: abort requested by the user");
+    }
+    e => unreachable!("unexpected WebPEncodingError variant: {e:?}"),
+  }
+}
+
+fn open_file(path: &Path) -> io::Result<File> {
+  File::open(path)
+    .map_err(|e| { errorln!("Could not parse {path:?}: {e}"); e })
+}

diff --git a/src/main.rs b/src/main.rs
@@ -1,4 +1,3 @@
-use image::{DynamicImage, ImageReader};
 use std::{
   cmp,
   env,
@@ -10,15 +9,16 @@ use std::{
   sync::mpsc,
   time::Instant,
 };
-use gallery_entry::{GalleryEntry, FileFormat, LicenseType};
 use threadpool::ThreadPool;
 
+use gallery_entry::{GalleryEntry, FileFormat, LicenseType};
 use escape::Escaped;
 
 #[macro_use]
 mod log;
-mod escape;
+mod image;
 mod gallery_entry;
+mod escape;
 
 /// A wrapper for displaying the path for the thumbnail of a given path
 pub struct ThumbPath<'a>(pub &'a GalleryEntry);
@@ -87,7 +87,7 @@ fn main() -> ExitCode {
         }
       }
     }
-    
+
     if !is_valid_arg {
       if arg.starts_with("-") {
         errorln!("Unknown option: {arg:?}");
@@ -434,6 +434,18 @@ fn write_license(f: &mut File) -> io::Result<()> {
 }
 
 fn render_thumbnail(pic: &GalleryEntry, thumb_path: &Path) -> Result<(), ()> {
+  const TARGET_HEIGHT: u32 = 500;
+
+  #[inline]
+  fn warn_img_size(src_width: u32, src_height: u32, src_path: &Path) {
+    let target_width = src_width * TARGET_HEIGHT / src_height;
+    let scale_x      = src_width / target_width;
+
+    if scale_x > 1 {
+      warnln!("Thumbnail for {src_path:?}? {src_width}×{src_height}: thumbnails are not downsampled");
+    }
+  }
+
   match pic.file_format {
     FileFormat::TeX => {
       // tikztosvg -o thumb_path
@@ -469,52 +481,27 @@ fn render_thumbnail(pic: &GalleryEntry, thumb_path: &Path) -> Result<(), ()> {
         );
         return Err(());
       }
-    },
+    }
     FileFormat::Svg => {
       let mut src_path = PathBuf::from(TARGET_PATH);
       src_path.push(IMAGES_PATH);
       src_path.push(&pic.file_name);
 
       copy(&src_path, thumb_path)?;
-    },
-    FileFormat::Jpeg | FileFormat::Png => {
-      /// Target height of the thumbnails
-      const THUMB_HEIGHT:       u32 = 500;
-      const WEBP_IMAGE_QUALITY: f32 = 90.0;
-
-      let mut thumb_file = create_file(thumb_path).map_err(|_| ())?;
-
-      let img_reader = ImageReader::open(&pic.path)
-        .map_err(|e| {
-          errorln!(
-            "Couldn't open file {path:?} to render thumbnail: {e}",
-            path = pic.file_name,
-          );
-        })?;
-
-      let img = img_reader
-        .decode()
-        .map_err(|e| {
-          errorln!(
-            "Faileded to decode image file {name:?}: {e}",
-            name = pic.file_name,
-          );
-        })?;
-
-      let h = THUMB_HEIGHT;
-      let w = (h * img.width()) / img.height();
-
-      // we should make sure that the image is in the RGBA8 format so that
-      // the webp crate can encode it
-      let img = DynamicImage::from(img.thumbnail(w, h).into_rgba8());
-      let mem = webp::Encoder::from_image(&img)
-        .expect("image should be in the RGBA8 format")
-        .encode(WEBP_IMAGE_QUALITY);
-
-      if let Err(e) = thumb_file.write_all(&mem) {
-        errorln!( "Couldn't write thumnail to file {thumb_path:?}: {e}");
-        return Err(());
-      }
+    }
+    FileFormat::Jpeg => {
+      // NOTE: we do not rescale the images since the scale-factor for the
+      //       actual images included in our gallery should always be 1
+      let img = image::parse_jpeg(&pic.path)?;
+      warn_img_size(img.width, img.height, &pic.path);
+      image::encode_webp(&img, thumb_path)?;
+    }
+    FileFormat::Png => {
+      // NOTE: we do not rescale the images since the scale-factor for the
+      //       actual images included in our gallery should always be 1
+      let img = image::parse_png(&pic.path)?;
+      warn_img_size(img.width, img.height, &pic.path);
+      image::encode_webp(&img, thumb_path)?;
     }
   }
 
@@ -534,7 +521,7 @@ fn needs_update(pic: &GalleryEntry, dst: &Path) -> bool {
 
 fn create_file(path: &Path) -> io::Result<File> {
   File::create(path)
-    .map_err(|e| { errorln!("Could not open file {path:?}: {e}"); e })
+    .map_err(|e| { errorln!("Could not open {path:?}: {e}"); e })
 }
 
 fn copy(from: &Path, to: &Path) -> Result<(), ()> {