diff --git a/reader/JFJochReaderImage.cpp b/reader/JFJochReaderImage.cpp
index 20f8a577..90f0bdef 100644
--- a/reader/JFJochReaderImage.cpp
+++ b/reader/JFJochReaderImage.cpp
@@ -130,7 +130,7 @@ void JFJochReaderImage::ProcessInputImage(const void *data, size_t npixel, int64
         }
     }
 
-    auto_foreground = count_histogram.Percentile(99.9).value_or(10);
+    auto_foreground = count_histogram.Percentile(auto_foreground_range).value_or(10);
 
     // Export top pixels (already sorted descending) into the existing vector interface
     for (int i = 0; i < top_pixels_acc.Size(); i++) {
@@ -232,7 +232,7 @@ void JFJochReaderImage::AddImage(const JFJochReaderImage &other) {
         }
     }
 
-    auto_foreground = count_histogram.Percentile(99.9).value_or(10);
+    auto_foreground = count_histogram.Percentile(auto_foreground_range).value_or(10);
 
     for (int i = 0; i < top_pixels_acc.Size(); i++) {
         const auto &e = top_pixels_acc[i];
diff --git a/reader/JFJochReaderImage.h b/reader/JFJochReaderImage.h
index 84eaaf9d..f9d159a1 100644
--- a/reader/JFJochReaderImage.h
+++ b/reader/JFJochReaderImage.h
@@ -42,7 +42,7 @@ class JFJochReaderImage {
     // This histogram operates in square root of count from 0 to 10^20
     Histogram count_histogram{100000};
 
-    constexpr static float auto_foreground_range = 0.001f;
+    constexpr static float auto_foreground_range = 99.0f;
     int32_t auto_foreground;
     void CalcAutoContrast();