diff --git a/UI/CaptureView.cs b/UI/CaptureView.cs
--- a/UI/CaptureView.cs
+++ b/UI/CaptureView.cs
@@ -257,6 +257,8 @@ namespace DesertPaintLab
             DesertPaintLab.AppSettings.Get("DebugScreenshot", out debugScreenshot);
             Gdk.Image rootImage = rootWindow.GetImage(0, 0, screenWidth, screenHeight);
             screenBuffer.GetFromImage(rootImage, rootImage.Colormap, 0, 0, 0, 0, screenWidth, screenHeight);
+            rootImage.Unref();
+            System.GC.Collect(); // really, clean up now
             //screenBuffer.GetFromDrawable(rootWindow,
             //  rootWindow.Colormap, 0, 0, 0, 0, screenWidth, screenHeight);
             int stride = screenBuffer.Rowstride;