Moved the /256 from the spatial filtering routine to it's proper place in the pyramid code.

dlib/image_transforms/image_pyramid.h

@@ -459,10 +459,10 @@ namespace dlib
                     separable_3x3_filter_block_grayscale(block, original, rr, cc, 3, 10, 3);
 
                     // bi-linearly interpolate block 
-                    assign_pixel(down[r][c]     , (block[0][0]*9 + block[1][0]*3 + block[0][1]*3 + block[1][1])/(16));
-                    assign_pixel(down[r][c+1]   , (block[0][2]*9 + block[1][2]*3 + block[0][1]*3 + block[1][1])/(16));
-                    assign_pixel(down[r+1][c]   , (block[2][0]*9 + block[1][0]*3 + block[2][1]*3 + block[1][1])/(16));
-                    assign_pixel(down[r+1][c+1] , (block[2][2]*9 + block[1][2]*3 + block[2][1]*3 + block[1][1])/(16));
+                    assign_pixel(down[r][c]     , (block[0][0]*9 + block[1][0]*3 + block[0][1]*3 + block[1][1])/(16*256));
+                    assign_pixel(down[r][c+1]   , (block[0][2]*9 + block[1][2]*3 + block[0][1]*3 + block[1][1])/(16*256));
+                    assign_pixel(down[r+1][c]   , (block[2][0]*9 + block[1][0]*3 + block[2][1]*3 + block[1][1])/(16*256));
+                    assign_pixel(down[r+1][c+1] , (block[2][2]*9 + block[1][2]*3 + block[2][1]*3 + block[1][1])/(16*256));
 
                     cc += size_in;
                 }

dlib/image_transforms/spatial_filtering.h

@@ -147,7 +147,7 @@ namespace dlib
             {
                 block[rr][cc] = (row_filt[rr][cc]*fe1 + 
                                 row_filt[rr+1][cc]*fm + 
-                                row_filt[rr+2][cc]*fe2)/256;
+                                row_filt[rr+2][cc]*fe2);
             }
         }