diff --git a/src/PNGDumper.cpp b/src/PNGDumper.cpp
index 8cf9ad9..92fb330 100644
--- a/src/PNGDumper.cpp
+++ b/src/PNGDumper.cpp
@@ -54,6 +54,8 @@ void PNGDumper::dumpImageSeries(const LayerData &layer)
 
     auto data = layer.data();
 
+    png::image<png::gray_pixel> image(shape[2], shape[3]);
+
     for (int i = 0; i < shape[0]; ++i) {
         for (int j = 0; j < shape[1]; ++j) {
             memcpy(buffer.data(), data, imagePixels * sizeof(DType));
@@ -63,8 +65,6 @@ void PNGDumper::dumpImageSeries(const LayerData &layer)
 
             clamp(buffer.begin(), buffer.end(), 0.0, 255.0);
 
-            png::image<png::gray_pixel> image(shape[2], shape[3]);
-
             for (int y = 0; y < shape[2]; ++y) {
                 for (int x = 0; x < shape[3]; ++x) {
                     image[x][y] = png::gray_pixel((int) buffer[x + y * shape[3]]);