Fixed off by one bug in AdaptiveThresholdImage.

diff --git a/MagickCore/threshold.c b/MagickCore/threshold.c
index 7a8b6f3954306e2fa03339f747e8f1c78a057806..788e33ee60e7bc9d7e3dc1b044588794b78d4adc 100644 (file)
--- a/MagickCore/threshold.c
+++ b/MagickCore/threshold.c
@@ -321,7 +321,7 @@ MagickExport Image *AdaptiveThresholdImage(const Image *image,
           channel_bias[channel]+=pixels[i];
           pixels+=(width-1)*GetPixelChannels(image);
           channel_sum[channel]+=pixels[i];
-          pixels+=GetPixelChannels(image)*image->columns;
+          pixels+=GetPixelChannels(image)*(image->columns+1);
         }
         mean=(double) (channel_sum[channel]/number_pixels+bias);
         SetPixelChannel(threshold_image,channel,(Quantum) ((double)