If available, use scrot on Linux for ImageGrab

docs/reference/ImageGrab.rst

@@ -15,8 +15,9 @@ or the clipboard to a PIL image memory.
     returned as an "RGBA" on macOS, or an "RGB" image otherwise.
     If the bounding box is omitted, the entire screen is copied.
 
-    On Linux, if ``xdisplay`` is ``None`` then ``gnome-screenshot`` will be used if it
-    is installed. To capture the default X11 display instead, pass ``xdisplay=""``.
+    On Linux, if ``xdisplay`` is ``None`` then (in order) ``scrot`` or
+    ``gnome-screenshot`` will be used if they are installed. To capture the default
+    X11 display instead, pass ``xdisplay=""``.
 
     .. versionadded:: 1.1.3 (Windows), 3.0.0 (macOS), 7.1.0 (Linux)
 

src/PIL/ImageGrab.py

@@ -61,10 +61,13 @@ def grab(bbox=None, include_layered_windows=False, all_screens=False, xdisplay=N
                 left, top, right, bottom = bbox
                 im = im.crop((left - x0, top - y0, right - x0, bottom - y0))
             return im
-        elif shutil.which("gnome-screenshot"):
+        elif shutil.which("gnome-screenshot") or shutil.which("scrot"):
             fh, filepath = tempfile.mkstemp(".png")
             os.close(fh)
-            subprocess.call(["gnome-screenshot", "-f", filepath])
+            if shutil.which("scrot"):  # prefer scrot, as it is less intrusive
+                subprocess.call([shutil.which("scrot"), "-z", "--overwrite", filepath])
+            else:
+                subprocess.call([shutil.which("gnome-screenshot"), "-f", filepath])
             im = Image.open(filepath)
             im.load()
             os.unlink(filepath)