diff --git a/crates/effects/src/pixel/artistic.rs b/crates/effects/src/pixel/artistic.rs
index 0a7e3aacc..f18b1709a 100644
--- a/crates/effects/src/pixel/artistic.rs
+++ b/crates/effects/src/pixel/artistic.rs
@@ -165,7 +165,7 @@ fn planes(px: &[[u8; 4]]) -> ([Vec<f32>; 3], Vec<f32>) {
 /// colours keep their hue. Slivers (the blends along softened edges) take the nearest large
 /// piece's colour, so the pieces meet with crisp edges. Coverage is kept.
 pub(super) fn cutout(px: &mut [[u8; 4]], w: usize, h: usize, space: &PixelSpace, levels: f64, simplicity: f64, fidelity: f64) {
-    if ![levels, simplicity, fidelity].iter().all(|v| v.is_finite()) || !(space.px.is_finite() && space.px > 0.0) {
+    if !([levels, simplicity, fidelity].iter().all(|v| v.is_finite()) && space.px.is_finite() && space.px > 0.0) {
         return;
     }
     let levels = levels.round().clamp(2.0, 8.0) as usize;
@@ -212,7 +212,7 @@ pub(super) fn cutout(px: &mut [[u8; 4]], w: usize, h: usize, space: &PixelSpace,
 /// channel, with black lines drawn on the edges of any of its colour channels and of its outline. `thickness` (0..10) widens the lines and
 /// `intensity` (0..10) darkens them and lets fainter edges take a line. Coverage is kept.
 pub(super) fn poster_edges(px: &mut [[u8; 4]], w: usize, h: usize, space: &PixelSpace, thickness: f64, intensity: f64, posterization: f64) {
-    if ![thickness, intensity, posterization].iter().all(|v| v.is_finite()) || !(space.px.is_finite() && space.px > 0.0) {
+    if !([thickness, intensity, posterization].iter().all(|v| v.is_finite()) && space.px.is_finite() && space.px > 0.0) {
         return;
     }
     let steps = (posterization.round().clamp(0.0, 6.0) + 1.0) as f32;
@@ -248,7 +248,7 @@ pub(super) fn glow_spread(size: f64) -> f64 {
 /// above 0) or from its dark areas (below 0), spread as far as |`size`| (0..24) says and as
 /// strong as `brightness` (0..50). Coverage is kept.
 pub(super) fn neon_glow(px: &mut [[u8; 4]], w: usize, h: usize, space: &PixelSpace, size: f64, brightness: f64, colour: [f32; 3]) {
-    if ![size, brightness].iter().all(|v| v.is_finite()) || !(space.px.is_finite() && space.px > 0.0) {
+    if !([size, brightness].iter().all(|v| v.is_finite()) && space.px.is_finite() && space.px > 0.0) {
         return;
     }
     let strength = (brightness / 50.0).clamp(0.0, 1.0) as f32;
diff --git a/crates/effects/src/pixel/tests.rs b/crates/effects/src/pixel/tests.rs
index 1a599a534..41300884f 100644
--- a/crates/effects/src/pixel/tests.rs
+++ b/crates/effects/src/pixel/tests.rs
@@ -2133,6 +2133,49 @@ fn artistic_params_take_defaults_and_stay_in_range() {
     }
 }
 
+#[test]
+fn artistic_filters_leave_invalid_coordinate_spaces_alone() {
+    let (w, h) = (16, 12);
+    let src = ramp(w, h);
+    let run = |f: &PixelFx, s: &PixelSpace| {
+        let mut out = src.clone();
+        f.apply(&mut out, w, h, s);
+        out
+    };
+    let colour = [0.3, 0.65, 1.0];
+    let filters = [
+        PixelFx::Cutout { levels: 4.0, simplicity: 4.0, fidelity: 2.0 },
+        PixelFx::NeonGlow { size: 5.0, brightness: 15.0, colour },
+        PixelFx::PosterEdges { thickness: 2.0, intensity: 1.0, posterization: 2.0 },
+    ];
+    for f in &filters {
+        assert_ne!(run(f, &space(w, h)), src, "{f:?} changes the art in a valid space");
+    }
+    let mut changed = Vec::new();
+    for f in &filters {
+        for px in [0.0, -1.0, f64::NAN, f64::INFINITY] {
+            if run(f, &PixelSpace { px, ..space(w, h) }) != src {
+                changed.push(format!("{f:?} at px {px}"));
+            }
+        }
+    }
+    for f in [
+        PixelFx::Cutout { levels: f64::NAN, simplicity: 4.0, fidelity: 2.0 },
+        PixelFx::Cutout { levels: 4.0, simplicity: f64::INFINITY, fidelity: 2.0 },
+        PixelFx::Cutout { levels: 4.0, simplicity: 4.0, fidelity: f64::NEG_INFINITY },
+        PixelFx::NeonGlow { size: f64::NAN, brightness: 15.0, colour },
+        PixelFx::NeonGlow { size: 5.0, brightness: f64::INFINITY, colour },
+        PixelFx::PosterEdges { thickness: f64::NAN, intensity: 1.0, posterization: 2.0 },
+        PixelFx::PosterEdges { thickness: 2.0, intensity: f64::INFINITY, posterization: 2.0 },
+        PixelFx::PosterEdges { thickness: 2.0, intensity: 1.0, posterization: f64::NEG_INFINITY },
+    ] {
+        if run(&f, &space(w, h)) != src {
+            changed.push(format!("{f:?}"));
+        }
+    }
+    assert!(changed.is_empty(), "directly constructed non-finite parameters and invalid spaces are harmless: {changed:?}");
+}
+
 #[test]
 fn cutout_paints_a_few_flat_colours_and_keeps_coverage() {
     let (w, h) = (64, 24);
diff --git a/crates/effects/src/raster.rs b/crates/effects/src/raster.rs
index e9a51fc43..23d67dff6 100644
--- a/crates/effects/src/raster.rs
+++ b/crates/effects/src/raster.rs
@@ -197,7 +197,7 @@ impl Rasterize {
         let (px, rest) = data.as_chunks_mut::<4>();
         let (src, src_rest) = image.as_chunks::<4>();
         let fits = |n: usize, w: usize, h: usize, rest: usize| w > 0 && h > 0 && rest == 0 && w.checked_mul(h) == Some(n);
-        if !fits(px.len(), w, h, rest.len()) || !fits(src.len(), cols, rows, src_rest.len()) || !(rect.width() > 0.0 && rect.height() > 0.0) {
+        if !(fits(px.len(), w, h, rest.len()) && fits(src.len(), cols, rows, src_rest.len()) && rect.width() > 0.0 && rect.height() > 0.0) {
             return;
         }
         let (sx, sy) = (cols as f64 / rect.width(), rows as f64 / rect.height());
diff --git a/crates/effects/src/tests.rs b/crates/effects/src/tests.rs
index f075e4095..34047cc05 100644
--- a/crates/effects/src/tests.rs
+++ b/crates/effects/src/tests.rs
@@ -834,6 +834,50 @@ fn drop_shadow_darkness_replaces_its_color_when_chosen() {
     assert_eq!(darkness(json!({})), None);
 }
 
+#[test]
+fn rasterize_compose_leaves_the_raster_alone_when_the_sizes_do_not_fit() {
+    let r = match raster_effects(&[fx(RASTERIZE, json!({}))]).as_slice() {
+        [RasterFx::Rasterize(r)] => *r,
+        other => panic!("{other:?}"),
+    };
+    let space = PixelSpace {
+        to_doc: Affine::IDENTITY,
+        px: 1.0,
+        center: Point::new(1.0, 1.0),
+        channels: pixel::Channels::Rgb,
+        line: 1.0,
+        extent: std::f64::consts::SQRT_2,
+    };
+    let compose = |len: usize, w: usize, h: usize, image: &[u8], cols: usize, rows: usize, rect: Rect| {
+        let mut data = vec![7; len];
+        r.compose(&mut data, w, h, &space, image, cols, rows, rect);
+        data
+    };
+    // A 2 × 2 red image over a 2 × 2 raster of one-point pixels: each pixel takes the image's color.
+    let red = [255, 0, 0, 255].repeat(4);
+    let mut long = red.clone();
+    long.extend([255, 0]);
+    let (img, long, area) = (red.as_slice(), long.as_slice(), Rect::new(0.0, 0.0, 2.0, 2.0));
+    assert_eq!(compose(16, 2, 2, img, 2, 2, area), red);
+    let cases = [
+        ("w × h is not the raster's pixel count", 16, 1, 2, img, 2, 2, area),
+        ("the raster's length is not a multiple of 4", 18, 2, 2, img, 2, 2, area),
+        ("cols × rows is not the image's pixel count", 16, 2, 2, img, 1, 2, area),
+        ("the image's length is not a multiple of 4", 16, 2, 2, long, 2, 2, area),
+        ("the image has no width", 16, 2, 2, img, 2, 2, Rect::new(0.0, 0.0, 0.0, 2.0)),
+        ("the image has no height", 16, 2, 2, img, 2, 2, Rect::new(0.0, 0.0, 2.0, 0.0)),
+        ("the image has a negative width", 16, 2, 2, img, 2, 2, Rect::new(2.0, 0.0, 0.0, 2.0)),
+        ("the image has a NaN width", 16, 2, 2, img, 2, 2, Rect::new(0.0, 0.0, f64::NAN, 2.0)),
+        ("the image has a NaN height", 16, 2, 2, img, 2, 2, Rect::new(0.0, 0.0, 2.0, f64::NAN)),
+    ];
+    let failures: Vec<_> = cases
+        .iter()
+        .filter(|&&(_, len, w, h, image, cols, rows, rect)| compose(len, w, h, image, cols, rows, rect) != vec![7; len])
+        .map(|c| c.0)
+        .collect();
+    assert!(failures.is_empty(), "{failures:?}");
+}
+
 #[test]
 fn blend_mode_names() {
     use vectorcraft_doc::color::BlendMode;