Fixed negative values appearing when resizing HDR images.

src/image_encode.cpp

@@ -426,7 +426,7 @@ namespace bimg
 				, 4, 3
 				, STBIR_FLAG_ALPHA_PREMULTIPLIED
 				, STBIR_EDGE_CLAMP
-				, STBIR_FILTER_DEFAULT
+				, STBIR_FILTER_CUBICBSPLINE
 				, STBIR_COLORSPACE_LINEAR
 				, NULL
 				);