diff --git a/libgimpwidgets/gimpcolorscale.c b/libgimpwidgets/gimpcolorscale.c
index d90c8087bc..7bb54cf2a5 100644
--- a/libgimpwidgets/gimpcolorscale.c
+++ b/libgimpwidgets/gimpcolorscale.c
@@ -139,7 +139,7 @@ gimp_color_scale_class_init (GimpColorScaleClass *klass)
 
   gtk_widget_class_set_css_name (widget_class, "GimpColorScale");
 
-  fish_lch_to_rgb   = babl_fish (babl_format ("CIE LCH(ab) double"),
+  fish_lch_to_rgb   = babl_fish (babl_format ("CIE LCH(ab) float"),
                                  babl_format ("R'G'B' double"));
   fish_hsv_to_rgb   = babl_fish (babl_format ("HSV float"),
                                  babl_format ("R'G'B' double"));
@@ -503,10 +503,10 @@ gimp_color_scale_set_format (GimpColorScale *scale,
   if (scale->format != format)
     {
       scale->format = format;
-      fish_lch_to_rgb   = babl_fish (babl_format ("CIE LCH(ab) double"),
-                                     babl_format_with_space ("R'G'B' double", format));
-      fish_hsv_to_rgb   = babl_fish (babl_format_with_space ("HSV float", format),
-                                     babl_format_with_space ("R'G'B' double", format));
+      fish_lch_to_rgb = babl_fish (babl_format ("CIE LCH(ab) float"),
+                                   babl_format_with_space ("R'G'B' double", format));
+      fish_hsv_to_rgb = babl_fish (babl_format_with_space ("HSV float", format),
+                                   babl_format_with_space ("R'G'B' double", format));
       scale->needs_render = TRUE;
       gtk_widget_queue_draw (GTK_WIDGET (scale));
     }
@@ -632,7 +632,7 @@ gimp_color_scale_render (GimpColorScale *scale)
   GtkRange *range = GTK_RANGE (scale);
   gdouble   rgb[4];
   gfloat    hsv[3];
-  gdouble   lch[3];
+  gfloat    lch[3];
   gint      multiplier = 1;
   guint     x, y;
   gdouble  *channel_value   = NULL;
@@ -654,7 +654,7 @@ gimp_color_scale_render (GimpColorScale *scale)
 
   gegl_color_get_pixel (scale->color, babl_format_with_space ("R'G'B'A double", scale->format), rgb);
   gegl_color_get_pixel (scale->color, babl_format_with_space ("HSV float", scale->format), hsv);
-  gegl_color_get_pixel (scale->color, babl_format ("CIE LCH(ab) double"), lch);
+  gegl_color_get_pixel (scale->color, babl_format ("CIE LCH(ab) float"), lch);
 
   switch (scale->channel)
     {
@@ -667,9 +667,9 @@ gimp_color_scale_render (GimpColorScale *scale)
     case GIMP_COLOR_SELECTOR_BLUE:       channel_value = &rgb[2]; break;
     case GIMP_COLOR_SELECTOR_ALPHA:      channel_value = &rgb[3]; break;
 
-    case GIMP_COLOR_SELECTOR_LCH_LIGHTNESS: channel_value = &lch[0]; break;
-    case GIMP_COLOR_SELECTOR_LCH_CHROMA:    channel_value = &lch[1]; break;
-    case GIMP_COLOR_SELECTOR_LCH_HUE:       channel_value = &lch[2]; break;
+    case GIMP_COLOR_SELECTOR_LCH_LIGHTNESS: channel_value_f = &lch[0]; break;
+    case GIMP_COLOR_SELECTOR_LCH_CHROMA:    channel_value_f = &lch[1]; break;
+    case GIMP_COLOR_SELECTOR_LCH_HUE:       channel_value_f = &lch[2]; break;
     }
 
   switch (scale->channel)
diff --git a/libgimpwidgets/gimpcolorscales.c b/libgimpwidgets/gimpcolorscales.c
index 99a00d2d0f..212d4fa11c 100644
--- a/libgimpwidgets/gimpcolorscales.c
+++ b/libgimpwidgets/gimpcolorscales.c
@@ -832,10 +832,10 @@ gimp_color_scales_update_scales (GimpColorScales *scales,
   values[GIMP_COLOR_SELECTOR_BLUE_U8]       = pixel[2] * 255.0;
   values[GIMP_COLOR_SELECTOR_ALPHA_U8]      = pixel[3] * 255.0;
 
-  gegl_color_get_pixel (color, babl_format ("CIE LCH(ab) double"), pixel);
-  values[GIMP_COLOR_SELECTOR_LCH_LIGHTNESS] = pixel[0];
-  values[GIMP_COLOR_SELECTOR_LCH_CHROMA]    = pixel[1];
-  values[GIMP_COLOR_SELECTOR_LCH_HUE]       = pixel[2];
+  gegl_color_get_pixel (color, babl_format ("CIE LCH(ab) float"), pixel_f);
+  values[GIMP_COLOR_SELECTOR_LCH_LIGHTNESS] = pixel_f[0];
+  values[GIMP_COLOR_SELECTOR_LCH_CHROMA]    = pixel_f[1];
+  values[GIMP_COLOR_SELECTOR_LCH_HUE]       = pixel_f[2];
 
   for (i = 0; i < G_N_ELEMENTS (scale_defs); i++)
     {
diff --git a/libgimpwidgets/gimpcolorselect.c b/libgimpwidgets/gimpcolorselect.c
index 7fa7ba73a7..fa0192c65b 100644
--- a/libgimpwidgets/gimpcolorselect.c
+++ b/libgimpwidgets/gimpcolorselect.c
@@ -347,9 +347,9 @@ gimp_color_select_class_init (GimpColorSelectClass *klass)
 
   gtk_widget_class_set_css_name (GTK_WIDGET_CLASS (klass), "GimpColorSelect");
 
-  fish_lch_to_rgb    = babl_fish (babl_format ("CIE LCH(ab) double"),
+  fish_lch_to_rgb    = babl_fish (babl_format ("CIE LCH(ab) float"),
                                   babl_format ("R'G'B' double"));
-  fish_lch_to_rgb_u8 = babl_fish (babl_format ("CIE LCH(ab) double"),
+  fish_lch_to_rgb_u8 = babl_fish (babl_format ("CIE LCH(ab) float"),
                                   babl_format ("R'G'B' u8"));
   rgbf_format        = babl_format ("R'G'B' float");
   rgbu_format        = babl_format ("R'G'B' u8");
@@ -681,9 +681,9 @@ gimp_color_select_set_format (GimpColorSelector *selector,
       rgbf_format        = babl_format_with_space ("R'G'B' float", format);
       rgbu_format        = babl_format_with_space ("R'G'B' u8", format);
       hsvf_format        = babl_format_with_space ("HSV float", format);
-      fish_lch_to_rgb    = babl_fish (babl_format ("CIE LCH(ab) double"),
+      fish_lch_to_rgb    = babl_fish (babl_format ("CIE LCH(ab) float"),
                                       babl_format_with_space ("R'G'B' double", format));
-      fish_lch_to_rgb_u8 = babl_fish (babl_format ("CIE LCH(ab) double"),
+      fish_lch_to_rgb_u8 = babl_fish (babl_format ("CIE LCH(ab) float"),
                                       babl_format_with_space ("R'G'B' u8", format));
 
       if (format == NULL || babl_format_get_space (format) == babl_space ("sRGB"))
@@ -806,7 +806,7 @@ gimp_color_select_simulation (GimpColorSelector *selector,
   if (format)
     {
       softproof_format      = format;
-      fish_lch_to_softproof = babl_fish (babl_format ("CIE LCH(ab) double"), format);
+      fish_lch_to_softproof = babl_fish (babl_format ("CIE LCH(ab) float"), format);
 
       if (babl_format_get_space (format) == babl_space ("sRGB"))
         {
@@ -939,22 +939,22 @@ gimp_color_select_update_values (GimpColorSelect *select)
       break;
 
     case COLOR_SELECT_LCH_LIGHTNESS:
-      values[0] = select->pos[2] * 100.0;
-      values[1] = select->pos[1] * 200.0;
-      values[2] = select->pos[0] * 360.0;
-      gegl_color_set_pixel (color, babl_format ("CIE LCH(ab) double"), values);
+      values_float[0] = select->pos[2] * 100.0;
+      values_float[1] = select->pos[1] * 200.0;
+      values_float[2] = select->pos[0] * 360.0;
+      gegl_color_set_pixel (color, babl_format ("CIE LCH(ab) float"), values);
       break;
     case COLOR_SELECT_LCH_CHROMA:
-      values[0] = select->pos[1] * 100.0;
-      values[1] = select->pos[2] * 200.0;
-      values[2] = select->pos[0] * 360.0;
-      gegl_color_set_pixel (color, babl_format ("CIE LCH(ab) double"), values);
+      values_float[0] = select->pos[1] * 100.0;
+      values_float[1] = select->pos[2] * 200.0;
+      values_float[2] = select->pos[0] * 360.0;
+      gegl_color_set_pixel (color, babl_format ("CIE LCH(ab) float"), values);
       break;
     case COLOR_SELECT_LCH_HUE:
-      values[0] = select->pos[1] * 100.0;
-      values[1] = select->pos[0] * 200.0;
-      values[2] = select->pos[2] * 360.0;
-      gegl_color_set_pixel (color, babl_format ("CIE LCH(ab) double"), values);
+      values_float[0] = select->pos[1] * 100.0;
+      values_float[1] = select->pos[0] * 200.0;
+      values_float[2] = select->pos[2] * 360.0;
+      gegl_color_set_pixel (color, babl_format ("CIE LCH(ab) float"), values);
       break;
 
     default:
@@ -971,13 +971,13 @@ gimp_color_select_update_pos (GimpColorSelect *select)
 {
   GimpColorSelector *selector = GIMP_COLOR_SELECTOR (select);
   GeglColor         *color    = gimp_color_selector_get_color (selector);
-  gdouble            rgb[3];
+  gfloat             rgb[3];
   gdouble            lch[3];
   gfloat             hsv[3];
 
   gegl_color_get_pixel (color, babl_format_with_space ("R'G'B' double", select->format), rgb);
   gegl_color_get_pixel (color, babl_format_with_space ("HSV float", select->format), hsv);
-  gegl_color_get_pixel (color, babl_format ("CIE LCH(ab) double"), lch);
+  gegl_color_get_pixel (color, babl_format ("CIE LCH(ab) float"), lch);
   g_object_unref (color);
 
   switch (select->z_color_fill)
@@ -1602,7 +1602,7 @@ static void
 color_select_render_lch_lightness (ColorSelectFill *csf)
 {
   guchar  *p   = csf->buffer;
-  gdouble  lch[4] = { 0.0, 0.0, 0.0, 1.0 };
+  gfloat   lch[4] = { 0.0, 0.0, 0.0, 1.0 };
   guchar   rgb[3];
   gint     i;
 
@@ -1621,7 +1621,7 @@ static void
 color_select_render_lch_chroma (ColorSelectFill *csf)
 {
   guchar  *p   = csf->buffer;
-  gdouble  lch[4] = { 80.0, 0.0, 0.0, 1.0 };
+  gfloat   lch[4] = { 80.0, 0.0, 0.0, 1.0 };
   guchar   rgb[3];
   gint     i;
 
@@ -1640,7 +1640,7 @@ static void
 color_select_render_lch_hue (ColorSelectFill *csf)
 {
   guchar  *p      = csf->buffer;
-  gdouble  lch[4] = { 80.0, 200.0, 0.0, 1.0 };
+  gfloat   lch[4] = { 80.0, 200.0, 0.0, 1.0 };
   guchar   rgb[3];
   gint     i;
 
@@ -1895,7 +1895,7 @@ color_select_render_lch_chroma_lightness (ColorSelectFill *csf)
 {
   GeglColor *c = NULL;
   guchar    *p = csf->buffer;
-  gdouble    lch[3];
+  gfloat     lch[3];
 
   c = gegl_color_new (NULL);
 
@@ -1906,7 +1906,7 @@ color_select_render_lch_chroma_lightness (ColorSelectFill *csf)
     {
       lch[1] = i * 200.0 / csf->width;
 
-      gegl_color_set_pixel (c, babl_format ("CIE LCH(ab) double"), lch);
+      gegl_color_set_pixel (c, babl_format ("CIE LCH(ab) float"), lch);
 
       if (gimp_color_is_out_of_gamut (c, babl_format_get_space (rgbf_format)) ||
           (softproof_format &&
@@ -1932,7 +1932,7 @@ color_select_render_lch_hue_lightness (ColorSelectFill *csf)
 {
   GeglColor *c = NULL;
   guchar    *p = csf->buffer;
-  gdouble    lch[3];
+  gfloat     lch[3];
 
   c = gegl_color_new (NULL);
 
@@ -1943,7 +1943,7 @@ color_select_render_lch_hue_lightness (ColorSelectFill *csf)
     {
       lch[2] = i * 360.0 / csf->width;
 
-      gegl_color_set_pixel (c, babl_format ("CIE LCH(ab) double"), lch);
+      gegl_color_set_pixel (c, babl_format ("CIE LCH(ab) float"), lch);
 
       if (gimp_color_is_out_of_gamut (c, babl_format_get_space (rgbf_format)) ||
           (softproof_format &&
@@ -1969,7 +1969,7 @@ color_select_render_lch_hue_chroma (ColorSelectFill *csf)
 {
   GeglColor *c = NULL;
   guchar    *p = csf->buffer;
-  gdouble    lch[3];
+  gfloat     lch[3];
   gint       i;
 
   c = gegl_color_new (NULL);
@@ -1981,7 +1981,7 @@ color_select_render_lch_hue_chroma (ColorSelectFill *csf)
     {
       lch[2] = i * 360.0 / csf->width;
 
-      gegl_color_set_pixel (c, babl_format ("CIE LCH(ab) double"), lch);
+      gegl_color_set_pixel (c, babl_format ("CIE LCH(ab) float"), lch);
 
       if (gimp_color_is_out_of_gamut (c, babl_format_get_space (rgbf_format)) ||
           (softproof_format &&