From a06d7ed70c80130be6503bbff865eb9c33a3d419 Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Tue, 22 Jan 2013 19:15:42 +0000
Subject: [PATCH]

---
 coders/fits.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/coders/fits.c b/coders/fits.c
index 5872b16cc..c58b0a62a 100644
--- a/coders/fits.c
+++ b/coders/fits.c
@@ -445,6 +445,9 @@ static Image *ReadFITSImage(const ImageInfo *image_info,
       for (x=0; x < (ssize_t) image->columns; x++)
       {
         pixel=GetFITSPixel(image,fits_info.bits_per_pixel);
+        if ((image->depth == 16) || (image->depth == 32) ||
+            (image->depth == 64))
+          pixel-=pow(2.0,(double) image->depth-1);
         SetPixelGray(image,ClampToQuantum(scale*(fits_info.scale*(pixel-
           fits_info.min_data)+fits_info.zero)),q);
         q+=GetPixelChannels(image);
-- 
2.50.1