diff --git a/crates/automation/src/content.rs b/crates/automation/src/content.rs
index 39cdaf96..0e97aa8b 100644
--- a/crates/automation/src/content.rs
+++ b/crates/automation/src/content.rs
@@ -164,6 +164,9 @@ impl Automation {
                 if a.get("text").is_some() {
                     return Err(bad("images have no text"));
                 }
+                if ["font", "size", "bold", "italic", "color", "align"].iter().any(|k| a.get(k).is_some()) {
+                    return Err(bad("font, size, bold, italic, color and align apply to text"));
+                }
                 if let Some(deg) = a.opt_int("rotate")? {
                     if deg.rem_euclid(90) != 0 {
                         return Err(bad("rotate must be a multiple of 90"));
diff --git a/crates/automation/tests/automation.rs b/crates/automation/tests/automation.rs
index abcf8e86..644ae404 100644
--- a/crates/automation/tests/automation.rs
+++ b/crates/automation/tests/automation.rs
@@ -3020,6 +3020,53 @@ fn adding_content_through_tools() {
     assert!(matches!(a.call("content_delete", &json!({ "doc": doc, "page": 1, "index": 5 })), Err(ToolError::Failed(_))));
 }
 
+/// Text styling on an added image is refused (#1331), as image transforms are on text, and the
+/// refusal leaves the content, the dirty flag and the undo and redo steps as they were.
+#[test]
+fn text_styling_on_an_image_is_refused_without_an_edit() {
+    let dir = workdir("content-style");
+    let mut png = Vec::new();
+    {
+        let mut enc = png::Encoder::new(&mut png, 1, 1);
+        enc.set_color(png::ColorType::Rgb);
+        enc.write_header().unwrap().write_image_data(&[80, 160, 200]).unwrap();
+    }
+    std::fs::write(dir.join("logo.png"), png).unwrap();
+    let mut a = auto(&dir);
+    let doc = ok(&mut a, "doc_open", json!({ "path": "a.pdf" }))["doc"].as_u64().unwrap();
+    ok(&mut a, "page_add_text", json!({ "doc": doc, "page": 1, "text": "sample", "at": [20, 20] }));
+    ok(&mut a, "page_add_image", json!({ "doc": doc, "page": 1, "path": "logo.png", "rect": [10, 100, 40, 130] }));
+    ok(&mut a, "content_update", json!({ "doc": doc, "page": 1, "index": 2, "rotate": 90 }));
+    ok(&mut a, "edit_undo", json!({ "doc": doc }));
+    ok(&mut a, "doc_save", json!({ "doc": doc, "path": "saved.pdf" }));
+    let state = |a: &Automation| {
+        let d = a.session().docs().iter().find(|d| d.id.0 == doc).unwrap();
+        (format!("{:?}", d.added), d.dirty, d.edit_generation(), d.can_undo().map(str::to_owned), d.can_redo().map(str::to_owned))
+    };
+    let before = state(&a);
+    assert!(!before.1 && before.4.is_some(), "a clean document with a step to redo: {before:?}");
+    for (key, value) in [
+        ("font", json!("times")),
+        ("size", json!(24)),
+        ("bold", json!(true)),
+        ("italic", json!(true)),
+        ("color", json!("red")),
+        ("align", json!("center")),
+    ] {
+        for rect in [None, Some(json!([20, 100, 50, 130]))] {
+            let mut args = json!({ "doc": doc, "page": 1, "index": 2 });
+            args[key] = value.clone();
+            if let Some(r) = rect {
+                args["rect"] = r;
+            }
+            assert!(matches!(a.call("content_update", &args), Err(ToolError::InvalidArgs(_))), "{args}");
+            assert_eq!(state(&a), before, "{args}");
+        }
+    }
+    ok(&mut a, "content_update", json!({ "doc": doc, "page": 1, "index": 1, "font": "times", "size": 24, "align": "center" }));
+    assert!(state(&a).1, "text still takes its styling");
+}
+
 #[test]
 fn form_formats_and_calculations_through_tools() {
     let dir = workdir("formcalc");