from http://www.oyranos.org/scm?p=oyranos.git;a=commitdiff;h=c39976bf5de8a70f71cef2ecafae13d17e811857
--- a/modules/oyranos_cmm_oPNG.c
+++ b/modules/oyranos_cmm_oPNG.c
@@ -816,7 +816,8 @@ oyImage_s *  oyImage_FromPNG         ( const char        * filename,
        spp = 2; break;
   case PNG_COLOR_TYPE_PALETTE:
        png_set_palette_to_rgb( png_ptr );
-       spp = 3; break;
+       /* expect alpha */
+       spp = 4; break;
   case PNG_COLOR_TYPE_RGB:
        spp = 3; break;
   case PNG_COLOR_TYPE_RGB_ALPHA:
@@ -884,10 +885,15 @@ oyImage_s *  oyImage_FromPNG         ( const char        * filename,
                                         oyToDataType_m(pixel_layout),
                                         0 );
     png_byte ** array2d = (png_byte**) oyArray2d_GetData( a );
-    int i;
+    int i,y;
 
+    /* both variants of libpng access appear equal */
+    if(1)
+      png_read_image( png_ptr, array2d );
+    else
     for( i = 0; i < num_passes; ++i )
-      png_read_rows( png_ptr, array2d, NULL, height );
+      for( y = 0; y < height; ++y )
+        png_read_row( png_ptr, array2d[y], NULL );
 
     oyImage_SetData ( image_in, (oyStruct_s**) &a, 0,0,0,0,0,0 );
   }