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diff --git a/MagickCore/signature.c b/MagickCore/signature.c
index 8e13e513edcb013fb7cb5d5a9e6f8f9fe50be62a..38b2021f82b467a43e35d9e16abceff2e6b55722 100644 (file)
--- a/MagickCore/signature.c
+++ b/MagickCore/signature.c
@@ -518,6 +518,8 @@ MagickExport MagickBooleanType SignatureImage(Image *image,
     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
     if (p == (const Quantum *) NULL)
       break;
+    SetStringInfoLength(signature,image->columns*GetPixelChannels(image)*
+      sizeof(pixel));
     q=pixels;
     for (x=0; x < (ssize_t) image->columns; x++)
     {