diff --git a/source/net/yacy/visualization/RasterPlotter.java b/source/net/yacy/visualization/RasterPlotter.java
index 2bac51836..91a78cf2f 100644
--- a/source/net/yacy/visualization/RasterPlotter.java
+++ b/source/net/yacy/visualization/RasterPlotter.java
@@ -1000,7 +1000,7 @@ public class RasterPlotter {
         final int height = image.getHeight(null);
 
         final Deflater scrunch = new Deflater(compressionLevel);
-        ByteBuffer outBytes = new ByteBuffer(1024 * 300); // avoid frequent resizing of the ByteBuffer
+        ByteBuffer outBytes = new ByteBuffer(1024 * 400); // avoid frequent resizing of the ByteBuffer
         final OutputStream compBytes = new BufferedOutputStream(new DeflaterOutputStream(outBytes, scrunch, 2048, false), 16384);
         int i = 0;
         for (int row = 0; row < height; row++) {