https://github.com/ImageMagick/ImageMagick/issues/1112

diff --git a/coders/json.c b/coders/json.c
index d68aeaac5e0271919d78bf1b315da4601ce26568..c7047ff9e5652d3311746d5bed8bae99afb494d0 100644 (file)
--- a/coders/json.c
+++ b/coders/json.c
@@ -723,6 +723,7 @@ static ssize_t PrintChannelStatistics(FILE *file,const PixelChannel channel,
     GetMagickPrecision(),(double) ClampToQuantum(scale*
     channel_statistics[channel].maxima),GetMagickPrecision(),scale*
     channel_statistics[channel].mean,GetMagickPrecision(),scale*
+    IsNaN(channel_statistics[channel].standard_deviation) != 0 ? MagickEpsilon :
     channel_statistics[channel].standard_deviation,GetMagickPrecision(),
     channel_statistics[channel].kurtosis,GetMagickPrecision(),
     channel_statistics[channel].skewness,GetMagickPrecision(),