Index: subsystems/win32/win32k/dib/dib16bpp.c
===================================================================
--- subsystems/win32/win32k/dib/dib16bpp.c	(revision 35845)
+++ subsystems/win32/win32k/dib/dib16bpp.c	(working copy)
@@ -1064,7 +1064,7 @@
     struct
     {
         USHORT  red:5,
-                green:6,
+                green:5,
                 blue:5;
    } col;
 } NICEPIXEL16;
@@ -1142,8 +1142,8 @@
                 DstPixel.us = DIB_GetSource(Source, SrcX++, SrcY, ColorTranslation);
                 SrcPixel.col.red = (DstPixel.col.red << 3) | (DstPixel.col.red >> 2);
 
-                SrcPixel.col.green = (DstPixel.col.green << 2) |
-                                     (DstPixel.col.green >> 4);
+                SrcPixel.col.green = (DstPixel.col.green << 3) |
+                                     (DstPixel.col.green >> 2);
 
                 SrcPixel.col.blue = (DstPixel.col.blue << 3) | (DstPixel.col.blue >> 2);
             }
@@ -1172,8 +1172,8 @@
          DstPixel.col.red = Clamp5(DstPixel.col.red * (255 - Alpha) / 255 +
                                    (SrcPixel.col.red >> 3));
 
-         DstPixel.col.green = Clamp6(DstPixel.col.green * (255 - Alpha) / 255 +
-                                     (SrcPixel.col.green >> 2));
+         DstPixel.col.green = Clamp5(DstPixel.col.green * (255 - Alpha) / 255 +
+                                     (SrcPixel.col.green >> 3));
 
          DstPixel.col.blue = Clamp5(DstPixel.col.blue * (255 - Alpha) / 255 +
                                     (SrcPixel.col.blue >> 3));
Index: subsystems/win32/win32k/dib/dib24bpp.c
===================================================================
--- subsystems/win32/win32k/dib/dib24bpp.c	(revision 35845)
+++ subsystems/win32/win32k/dib/dib24bpp.c	(working copy)
@@ -661,11 +661,14 @@
          Alpha = ((BlendFunc.AlphaFormat & AC_SRC_ALPHA) != 0) ?
                  SrcPixel.col.alpha : BlendFunc.SourceConstantAlpha;
 
-         DstPixel.ul = *Dst;
+         //copy only 24bits of dst
+         DstPixel.ul = *(PUSHORT)(Dst) + (*(Dst+2) << 16);
          DstPixel.col.red = Clamp8(DstPixel.col.red * (255 - Alpha) / 255 + SrcPixel.col.red);
          DstPixel.col.green = Clamp8(DstPixel.col.green * (255 - Alpha) / 255 + SrcPixel.col.green);
          DstPixel.col.blue = Clamp8(DstPixel.col.blue * (255 - Alpha) / 255 + SrcPixel.col.blue);
-         *Dst = DstPixel.ul;
+         //copy back 24bits of result
+         *(PUSHORT)(Dst) = (USHORT)(DstPixel.ul & 0xFFFF);
+         *(Dst + 2) = (UCHAR)((DstPixel.ul >> 16) & 0xFF);
          Dst = (PUCHAR)((ULONG_PTR)Dst + 3);
       }
       Dst = (PUCHAR)((ULONG_PTR)Dst + DstDelta);