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

diff -Naurp libgd-2.1.0/src/gd.c libgd-2.1.0.oden/src/gd.c
--- libgd-2.1.0/src/gd.c	2013-06-25 11:58:23.000000000 +0200
+++ libgd-2.1.0.oden/src/gd.c	2013-07-22 10:02:40.130046673 +0200
@@ -3481,7 +3481,7 @@ 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]);
 				}
@@ -3498,6 +3498,12 @@ 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-2.1.0/src/gd_interpolation.c libgd-2.1.0.oden/src/gd_interpolation.c
--- libgd-2.1.0/src/gd_interpolation.c	2013-06-25 11:58:23.000000000 +0200
+++ libgd-2.1.0.oden/src/gd_interpolation.c	2013-07-22 10:16:49.235122495 +0200
@@ -1690,13 +1690,6 @@ gdImagePtr gdImageRotateNearestNeighbour
 	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;
@@ -1756,12 +1749,6 @@ gdImagePtr gdImageRotateGeneric(gdImageP
 		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) {
@@ -1815,13 +1802,6 @@ gdImagePtr gdImageRotateBilinear(gdImage
 	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;
@@ -1941,13 +1921,6 @@ gdImagePtr gdImageRotateBicubicFixed(gdI
 	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) {
@@ -2204,6 +2177,16 @@ 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) {