diff --git a/src/engine/formulas.cpp b/src/engine/formulas.cpp
index be7adf0..e7352f0 100644
--- a/src/engine/formulas.cpp
+++ b/src/engine/formulas.cpp
@@ -184,7 +184,7 @@ static void color_f_normalize(number_t &v) {
     }
 }
 
-static float color_f_func(number_t v, const float speed, const int func) {
+static float color_f_func(number_t v, const float speed, const int func, const int shift) {
     color_f_normalize(v);
     switch (func) {
     case 1:
@@ -235,6 +235,7 @@ static float color_f_func(number_t v, const float speed, const int func) {
         break;
     }
     v = v * speed;
+    v += shift;
     color_f_normalize(v);
     return v;
 }
@@ -242,16 +243,18 @@ static float color_f_func(number_t v, const float speed, const int func) {
 static void color_precalc(number_t &iter, int inset) {
     const float speed = inset ? cfractalc.incolorspeed : cfractalc.outcolorspeed;
     const int func = inset ? cfractalc.incolorfun : cfractalc.outcolorfun;
-    iter = (color_f_func(iter / SMUL, speed, func) * SMUL);
+    const int shift = inset ? cfractalc.incolorshift : cfractalc.outcolorshift;
+    iter = (color_f_func(iter / SMUL, speed, func, shift) * SMUL);
 }
 static void color_precalc(number_t &zre, number_t &zim, number_t &pre,
                           number_t &pim, int inset) {
     const float speed = inset ? cfractalc.incolorspeed : cfractalc.outcolorspeed;
     const int func = inset ? cfractalc.incolorfun : cfractalc.outcolorfun;
-    zre = color_f_func(zre, speed, func);
-    zim = color_f_func(zim, speed, func);
-    pre = color_f_func(pre, speed, func);
-    pim = color_f_func(pim, speed, func);
+    const int shift = inset ? cfractalc.incolorshift : cfractalc.outcolorshift;
+    zre = color_f_func(zre, speed, func, shift);
+    zim = color_f_func(zim, speed, func, shift);
+    pre = color_f_func(pre, speed, func, shift);
+    pim = color_f_func(pim, speed, func, shift);
 }
 
 /* 2009-07-30 JB Langston:
diff --git a/src/engine/fractal.cpp b/src/engine/fractal.cpp
index d07946b..f6834c3 100644
--- a/src/engine/fractal.cpp
+++ b/src/engine/fractal.cpp
@@ -312,8 +312,10 @@ fractal_context *make_fractalc(const int formula, float wi, float he)
     new_ctxt->outtcolor = 0;
     new_ctxt->incolorfun = 0;
     new_ctxt->incolorspeed = 1.0f;
+    new_ctxt->incolorshift = 0;
     new_ctxt->outcolorfun = 0;
     new_ctxt->outcolorspeed = 1.0f;
+    new_ctxt->outcolorshift = 0;
     new_ctxt->slowmode = 0;
     new_ctxt->range = 3;
     new_ctxt->angle = 0;
diff --git a/src/include/fractal.h b/src/include/fractal.h
index 81f6329..e1a8c14 100644
--- a/src/include/fractal.h
+++ b/src/include/fractal.h
@@ -83,6 +83,7 @@ struct fractal_context {
     //MSUMMO BEGIN HACK
     number_t incolorspeed, outcolorspeed;
     int incolorfun, outcolorfun;
+    int incolorshift, outcolorshift;
     //MSUMMO END HACK
     int mandelbrot;
     int plane;
diff --git a/src/include/ui_helper.h b/src/include/ui_helper.h
index 852dfc8..f978a5b 100644
--- a/src/include/ui_helper.h
+++ b/src/include/ui_helper.h
@@ -425,8 +425,10 @@ void uih_setouttcolor(uih_context *c, int mode);
 
 void uih_setincolorspeed(uih_context *c, number_t speed);
 void uih_setincolorfun(uih_context *c, int func);
+void uih_setincolorshift(uih_context *c, int shift);
 void uih_setoutcolorspeed(uih_context *c, number_t speed);
 void uih_setoutcolorfun(uih_context *c, int func);
+void uih_setoutcolorshift(uih_context *c, int shift);
 
 void uih_setplane(uih_context *c, int mode);
 void uih_setmandelbrot(uih_context *c, int mode, int mousex, int mousey);
diff --git a/src/ui-hlp/menu.cpp b/src/ui-hlp/menu.cpp
index 600fdec..737a6ed 100644
--- a/src/ui-hlp/menu.cpp
+++ b/src/ui-hlp/menu.cpp
@@ -603,6 +603,21 @@ static menudialog *uih_getoutcolorspeeddialog(struct uih_context *c)
     return (uih_fpdialog);
 }
 
+static menudialog *uih_getincolorshiftdialog(struct uih_context *c)
+{
+    if (c != NULL)
+        uih_numdialog[0].defint = c->fcontext->incolorshift;
+    return (uih_numdialog);
+}
+
+static menudialog *uih_getoutcolorshiftdialog(struct uih_context *c)
+{
+    if (c != NULL)
+        uih_numdialog[0].defint = c->fcontext->outcolorshift;
+    return (uih_numdialog);
+}
+
+
 int defthreads = 0;
 
 static menudialog *uih_getthreaddialog(struct uih_context *c)
@@ -1333,6 +1348,12 @@ void uih_registermenus_i18n(void)
     MENUDIALOG_I("fractal", NULL, TR("Menu", "Outside coloring speed"),
                  "outcolorspeed", MENUFLAG_NOMENU | MENUFLAG_INTERRUPT,
                  uih_setoutcolorspeed, uih_fpdialog);
+    MENUDIALOG_I("fractal", NULL, TR("Menu", "Inside coloring shift"),
+                 "incolorshift", MENUFLAG_NOMENU | MENUFLAG_INTERRUPT,
+                 uih_setincolorshift, uih_numdialog);
+    MENUDIALOG_I("fractal", NULL, TR("Menu", "Outside coloring shift"),
+                 "outcolorshift", MENUFLAG_NOMENU | MENUFLAG_INTERRUPT,
+                 uih_setoutcolorshift, uih_numdialog);
     MENUDIALOG_I("fractal", NULL, TR("Menu", "Julia seed"), "juliaseed",
                  MENUFLAG_NOMENU | MENUFLAG_INTERRUPT, uih_setjuliaseed,
                  uih_coorddialog);
@@ -1517,6 +1538,12 @@ static const menuitem menuitems2[] = {
     MENUCDIALOG("moutcoloring", NULL, TR("Menu", "Coloring speed"), "moutcolorspeed",
         MENUFLAG_INTERRUPT,
         uih_setoutcolorspeed, uih_getoutcolorspeeddialog),
+    MENUCDIALOG("mincoloring", NULL, TR("Menu", "Coloring shift"), "mincolorshift",
+        MENUFLAG_INTERRUPT,
+        uih_setincolorshift, uih_getincolorshiftdialog),
+    MENUCDIALOG("moutcoloring", NULL, TR("Menu", "Coloring shift"), "moutcolorshift",
+        MENUFLAG_INTERRUPT,
+        uih_setoutcolorshift, uih_getoutcolorshiftdialog),
     SUBMENU("mincoloring", NULL, "Coloring speed functions",
             "mincolorfun"),
     SUBMENU("moutcoloring", NULL, "Coloring speed functions",
diff --git a/src/ui-hlp/save.cpp b/src/ui-hlp/save.cpp
index a48507d..bb62fb2 100644
--- a/src/ui-hlp/save.cpp
+++ b/src/ui-hlp/save.cpp
@@ -478,12 +478,18 @@ void uih_saveframe(struct uih_context *uih)
         if (s->fcontext->incolorspeed != uih->fcontext->incolorspeed)
             save_floatc(uih, "incolorspeed", uih->fcontext->incolorspeed),
                 s->fcontext->incolorspeed = uih->fcontext->incolorspeed;
+        if (s->fcontext->incolorshift != uih->fcontext->incolorshift)
+            save_intc(uih, "incolorshift", uih->fcontext->incolorshift),
+                s->fcontext->incolorshift = uih->fcontext->incolorshift;
         if (s->fcontext->outcolorfun != uih->fcontext->outcolorfun)
             save_intc(uih, "outcolorfun", uih->fcontext->outcolorfun),
                 s->fcontext->outcolorfun = uih->fcontext->outcolorfun;
         if (s->fcontext->outcolorspeed != uih->fcontext->outcolorspeed)
             save_floatc(uih, "outcolorspeed", uih->fcontext->outcolorspeed),
                 s->fcontext->outcolorspeed = uih->fcontext->outcolorspeed;
+        if (s->fcontext->outcolorshift != uih->fcontext->outcolorshift)
+            save_intc(uih, "outcolorshift", uih->fcontext->outcolorshift),
+                s->fcontext->outcolorshift = uih->fcontext->outcolorshift;
         if (s->fcontext->mandelbrot != uih->fcontext->mandelbrot)
             save_onoffc(uih, "julia", !uih->fcontext->mandelbrot),
                 s->fcontext->mandelbrot = uih->fcontext->mandelbrot;
@@ -608,8 +614,10 @@ int uih_save_enable(struct uih_context *uih, xio_file f, int mode)
     s->fcontext->mandelbrot = 1;
     s->fcontext->incolorfun = 0;
     s->fcontext->incolorspeed = 1.0f;
+    s->fcontext->incolorshift = 0;
     s->fcontext->outcolorfun = 0;
     s->fcontext->outcolorspeed = 1.0f;
+    s->fcontext->outcolorshift = 0;
     s->fcontext->plane = 0;
     s->fcontext->range = 3;
     s->fcontext->angle = 0;
diff --git a/src/ui-hlp/ui_helper.cpp b/src/ui-hlp/ui_helper.cpp
index 7100dd5..4a9ded9 100644
--- a/src/ui-hlp/ui_helper.cpp
+++ b/src/ui-hlp/ui_helper.cpp
@@ -1789,6 +1789,14 @@ void uih_setincolorfun(uih_context *c, int func){
     }
 }
 
+void uih_setincolorshift(uih_context *c, int shift) {
+    if (c->fcontext->incolorshift != shift) {
+        c->fcontext->incolorshift = shift;
+        c->fcontext->version++;
+        uih_newimage(c);
+    }
+}
+
 void uih_setoutcolorspeed(uih_context *c, number_t speed){
     if (c->fcontext->outcolorspeed != (number_t)speed) {
         c->fcontext->outcolorspeed = speed;
@@ -1812,6 +1820,14 @@ void uih_setoutcolorfun(uih_context *c, int func){
     }
 }
 
+void uih_setoutcolorshift(uih_context *c, int shift) {
+    if (c->fcontext->outcolorshift != shift) {
+        c->fcontext->outcolorshift = shift;
+        c->fcontext->version++;
+        uih_newimage(c);
+    }
+}
+
 void uih_setperbutation(uih_context *c, number_t zre, number_t zim)
 {
     if (c->fcontext->bre != zre || c->fcontext->bim != zim) {
@@ -2178,8 +2194,10 @@ void uih_initstate(struct uih_context *uih)
     uih_setoutcoloringmode(uih, 0);
     uih_setincolorspeed(uih, 1.0);
     uih_setincolorfun(uih, 0);
+    uih_setincolorshift(uih, 0);
     uih_setoutcolorspeed(uih, 1.0);
     uih_setoutcolorfun(uih, 0);
+    uih_setoutcolorshift(uih, 0);
     uih_setcycling(uih, 30);
     uih_display(uih);
     uih_setfastmode(uih, 2);