diff --git a/commands/imagelib/effects/kpEffectFlattenCommand.h b/commands/imagelib/effects/kpEffectFlattenCommand.h
--- a/commands/imagelib/effects/kpEffectFlattenCommand.h
+++ b/commands/imagelib/effects/kpEffectFlattenCommand.h
@@ -39,7 +39,7 @@
 class kpEffectFlattenCommand : public kpEffectCommandBase
 {
 public:
-    kpEffectFlattenCommand (const QColor &color1, const QColor &color2,
+    kpEffectFlattenCommand (QColor color1, QColor color2,
                             bool actOnSelection,
                             kpCommandEnvironment *environ);
     ~kpEffectFlattenCommand () override;
diff --git a/commands/imagelib/effects/kpEffectFlattenCommand.cpp b/commands/imagelib/effects/kpEffectFlattenCommand.cpp
--- a/commands/imagelib/effects/kpEffectFlattenCommand.cpp
+++ b/commands/imagelib/effects/kpEffectFlattenCommand.cpp
@@ -28,20 +28,21 @@
 
 #define DEBUG_KP_EFFECT_FLATTEN 0
 
+#include <utility>
 
 #include "kpEffectFlattenCommand.h"
 #include "imagelib/effects/kpEffectFlatten.h"
 
 #include <KLocalizedString>
 
 //--------------------------------------------------------------------------------
 
-kpEffectFlattenCommand::kpEffectFlattenCommand (const QColor &color1,
-        const QColor &color2,
+kpEffectFlattenCommand::kpEffectFlattenCommand (QColor color1,
+        QColor color2,
         bool actOnSelection,
         kpCommandEnvironment *environ)
     : kpEffectCommandBase (i18n ("Flatten"), actOnSelection, environ),
-      m_color1 (color1), m_color2 (color2)
+      m_color1 (std::move(color1)), m_color2 (std::move(color2))
 {
 }
 
diff --git a/dialogs/imagelib/transforms/kpTransformPreviewDialog.cpp b/dialogs/imagelib/transforms/kpTransformPreviewDialog.cpp
--- a/dialogs/imagelib/transforms/kpTransformPreviewDialog.cpp
+++ b/dialogs/imagelib/transforms/kpTransformPreviewDialog.cpp
@@ -1,4 +1,3 @@
-
 /*
    Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
    All rights reserved.
diff --git a/document/kpDocumentSaveOptions.cpp b/document/kpDocumentSaveOptions.cpp
--- a/document/kpDocumentSaveOptions.cpp
+++ b/document/kpDocumentSaveOptions.cpp
@@ -79,7 +79,7 @@
 kpDocumentSaveOptions::kpDocumentSaveOptions (QString mimeType, int colorDepth, bool dither, int quality)
     : d (new kpDocumentSaveOptionsPrivate ())
 {
-    d->m_mimeType = mimeType;
+    d->m_mimeType = std::move(mimeType);
     d->m_colorDepth = colorDepth;
     d->m_dither = dither;
     d->m_quality = quality;