diff --git a/SpectrumView.pas b/SpectrumView.pas
index 3445ad6..0b3e73d 100644
--- a/SpectrumView.pas
+++ b/SpectrumView.pas
@@ -834,7 +834,12 @@ begin
   begin
     FWfBitmapW := W; FWfBitmapH := H;
     SetLength(FWfPixels, W * H);
-    FillDWord(FWfPixels[0], W * H, 0);
+    // TColor = $00BBGGRR → waterfall pixel = $FF_RR_GG_BB (swap R и B)
+    Pal := $FF000000
+      or ((LongWord(FTheme.Panel) and $FF) shl 16)
+      or  (LongWord(FTheme.Panel) and $FF00)
+      or ((LongWord(FTheme.Panel) shr 16) and $FF);
+    FillDWord(FWfPixels[0], W * H, Pal);
     FWfBitmap.SetSize(W, H);
     FreeAndNil(FWfIntfImg);
   end;
@@ -1171,7 +1176,7 @@ begin
   if (FWfBitmap <> nil) and (FWfBitmap.Width = W) and (FWfBitmap.Height = H) then
     PB.Canvas.Draw(0, 0, FWfBitmap)
   else begin
-    PB.Canvas.Brush.Color := clBlack;
+    PB.Canvas.Brush.Color := FTheme.Panel;
     PB.Canvas.FillRect(Rect(0, 0, W, H));
   end;
   if FMarkerActive then DrawMarkerLine(PB.Canvas, W, H);