http://git.php.net/?p=php-src.git;a=commit;h=07e52857b5f7a65c1552628e14a8a6aeeea24508

diff -Naurp libgd-2.1.1/src/gd.c libgd-2.1.1.oden/src/gd.c
--- libgd-2.1.1/src/gd.c	2015-01-06 10:16:03.000000000 +0100
+++ libgd-2.1.1.oden/src/gd.c	2015-02-02 09:25:06.107771087 +0100
@@ -3631,7 +3631,7 @@ BGD_DECLARE(int) gdImagePaletteToTrueCol
 			for (x = 0; x < sx; x++) {
 				const unsigned char c = *(src_row + x);
 				if (c == src->transparent) {
-					*(dst_row + x) = gdTrueColorAlpha(0, 0, 0, 127);;
+					*(dst_row + x) = gdTrueColorAlpha(0, 0, 0, 127);
 				} else {
 					*(dst_row + x) = gdTrueColorAlpha(src->red[c], src->green[c], src->blue[c], src->alpha[c]);
 				}
@@ -3648,6 +3648,12 @@ BGD_DECLARE(int) gdImagePaletteToTrueCol
 	src->pixels = NULL;
 	src->alphaBlendingFlag = 0;
 	src->saveAlphaFlag = 1;
+
+	if (src->transparent >= 0) {
+		const unsigned char c = src->transparent;
+		src->transparent =  gdTrueColorAlpha(src->red[c], src->green[c], src->blue[c], src->alpha[c]);
+	}
+
 	return 1;
 
 clean_on_error:
diff -Naurp libgd-2.1.1/src/gd_interpolation.c libgd-2.1.1.oden/src/gd_interpolation.c
--- libgd-2.1.1/src/gd_interpolation.c	2015-01-06 10:16:03.000000000 +0100
+++ libgd-2.1.1.oden/src/gd_interpolation.c	2015-02-02 09:25:06.107771087 +0100
@@ -1684,13 +1684,6 @@ gdImageRotateNearestNeighbour(gdImagePtr
 	unsigned int i;
 	gdImagePtr dst;
 
-	/* impact perf a bit, but not that much. Implementation for palette
-	   images can be done at a later point.
-	*/
-	if (src->trueColor == 0) {
-		gdImagePaletteToTrueColor(src);
-	}
-
 	dst = gdImageCreateTrueColor(new_width, new_height);
 	if (!dst) {
 		return NULL;
@@ -1751,12 +1744,6 @@ gdImageRotateGeneric(gdImagePtr src, con
 		return NULL;
 	}
 
-	/* impact perf a bit, but not that much. Implementation for palette
-	   images can be done at a later point.
-	*/
-	if (src->trueColor == 0) {
-		gdImagePaletteToTrueColor(src);
-	}
 
 	dst = gdImageCreateTrueColor(new_width, new_height);
 	if (!dst) {
@@ -1811,13 +1798,6 @@ gdImageRotateBilinear(gdImagePtr src, co
 	unsigned int src_offset_x, src_offset_y;
 	gdImagePtr dst;
 
-	/* impact perf a bit, but not that much. Implementation for palette
-	   images can be done at a later point.
-	*/
-	if (src->trueColor == 0) {
-		gdImagePaletteToTrueColor(src);
-	}
-
 	dst = gdImageCreateTrueColor(new_width, new_height);
 	if (dst == NULL) {
 		return NULL;
@@ -1938,13 +1918,6 @@ gdImageRotateBicubicFixed(gdImagePtr src
 	unsigned int i;
 	gdImagePtr dst;
 
-	/* impact perf a bit, but not that much. Implementation for palette
-	   images can be done at a later point.
-	*/
-	if (src->trueColor == 0) {
-		gdImagePaletteToTrueColor(src);
-	}
-
 	dst = gdImageCreateTrueColor(new_width, new_height);
 
 	if (dst == NULL) {
@@ -2201,6 +2174,16 @@ BGD_DECLARE(gdImagePtr) gdImageRotateInt
 		return NULL;
 	}
 
+	/* impact perf a bit, but not that much. Implementation for palette
+	   images can be done at a later point.
+	*/
+	if (src->trueColor == 0) {
+		if (bgcolor >= 0) {
+			bgcolor =  gdTrueColorAlpha(src->red[bgcolor], src->green[bgcolor], src->blue[bgcolor], src->alpha[bgcolor]);
+		}
+		gdImagePaletteToTrueColor(src);
+	}
+
 	/* 0 && 90 degrees multiple rotation, 0 rotation simply clones the return image and convert it
 	   to truecolor, as we must return truecolor image. */
 	switch (angle_rounded) {