diff --git a/src/screenshot.rs b/src/screenshot.rs
index ecf75b3..d3848eb 100644
--- a/src/screenshot.rs
+++ b/src/screenshot.rs
@@ -14,16 +14,12 @@
 //! windows (`notifications::spawn`/`osd::spawn`, built and primed with
 //! sample data by `main.rs` before `dispatch` runs — see [`Handles`]).
 
+use bread_utils::screenshot_cli::{validate_pair, DEFAULT_HEIGHT, DEFAULT_WIDTH, SETTLE_DELAY};
 use clap::Parser;
 use gtk4::prelude::*;
 use std::path::PathBuf;
 use std::time::Duration;
 
-/// Extra settle time after `map` for the first frame to actually paint
-/// before grim runs — `map` fires once the surface exists, not once
-/// anything has been drawn into it.
-const SETTLE_DELAY: Duration = Duration::from_millis(300);
-
 /// Settle time for views whose content depends on `bar::stats::spawn_poller`'s
 /// 2-second background loop (control-panel's CPU/RAM/PWR/GPU/network labels,
 /// gated on popover visibility) or a similar live-data popover load
@@ -38,7 +34,7 @@ const LIVE_DATA_SETTLE_DELAY: Duration = Duration::from_millis(2_200);
 /// popover at all) — presumably the parent widget's own allocation isn't
 /// settled yet at that exact point. Giving the initial layout pass a beat to
 /// finish first is what makes it actually render.
-const PRE_POPUP_DELAY: Duration = Duration::from_millis(300);
+const PRE_POPUP_DELAY: Duration = SETTLE_DELAY;
 
 const KNOWN_VIEWS: &[&str] = &[
     "bar",
@@ -68,11 +64,11 @@ pub struct Cli {
     /// Capture canvas width — matches the isolated compositor's output width
     /// (`bread-capture --isolate-width`) so the geometry passed to `grim`
     /// doesn't depend on querying anything at capture time.
-    #[arg(long, default_value_t = 1920)]
+    #[arg(long, default_value_t = DEFAULT_WIDTH)]
     pub width: u32,
 
     /// Capture canvas height — see `width`.
-    #[arg(long, default_value_t = 1080)]
+    #[arg(long, default_value_t = DEFAULT_HEIGHT)]
     pub height: u32,
 
     /// Toggle the in-memory notification history on a running breadbar, then
@@ -89,16 +85,20 @@ pub struct ScreenshotRequest {
 }
 
 impl Cli {
-    /// `None` for a normal run. Exits the process with an error if
-    /// `--screenshot` was given without `--output`, before any GTK/relm4
+    /// `None` for a normal run. Exits the process with an error if the
+    /// `--screenshot` / `--output` pair is incomplete, before any GTK/relm4
     /// setup happens.
     pub fn screenshot_request(&self) -> Option<ScreenshotRequest> {
-        let view = self.screenshot.clone()?;
-        let Some(output) = self.output.clone() else {
-            eprintln!("breadbar: --screenshot requires --output");
+        if let Err(e) = validate_pair(self.screenshot.as_deref(), self.output.as_deref()) {
+            eprintln!("breadbar: {e}");
             std::process::exit(1);
-        };
-        Some(ScreenshotRequest { view, output, width: self.width, height: self.height })
+        }
+        Some(ScreenshotRequest {
+            view: self.screenshot.clone()?,
+            output: self.output.clone()?,
+            width: self.width,
+            height: self.height,
+        })
     }
 }