Author: Ole Streicher <olebole@debian.org>
Description: Avoid NaN in asinh calculation.
 Also, ignore NaN in histogram creation.
--- a/histogram.c
+++ b/histogram.c
@@ -83,8 +83,10 @@
                                 ind = 0;
                         else if (value > dmax)
                                 ind = length-1;
-                        else
+                        else if (isfinite(value))
                                 ind = ceil ((value-dmin) / binsize);
+                        else
+                                continue;
                         hist[ind] += 1.0;
                 }
         }
--- a/image_scale.c
+++ b/image_scale.c
@@ -326,8 +326,11 @@
                         if (t > maxval)
                                 maxval = t;
                 }
-
-                weight = asinh (sum * nonlinearity) / (nonlinearity * sum);
+                if (sum * nonlinearity == 0.0) {
+                        weight = 1.0;
+                } else {
+                        weight = asinh (sum * nonlinearity) / (nonlinearity * sum);
+                }
                 for (k = 0; k < Image->channels; k++) {
                         if (Image->data[k] == NULL) 
                                 continue;