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From 3e10f7c3c9f0394dfd6ebd372bc34a172dabc8ff Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Thu, 3 Oct 2019 18:24:44 -0400
Subject: [PATCH] https://github.com/ImageMagick/ImageMagick/issues/1713
---
coders/hdr.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/coders/hdr.c b/coders/hdr.c
index ab02f8e52..77e3c6336 100644
--- a/coders/hdr.c
+++ b/coders/hdr.c
@@ -786,9 +786,12 @@ static MagickBooleanType WriteHDRImage(const ImageInfo *image_info,Image *image)
exponent;
gamma=frexp(gamma,&exponent)*256.0/gamma;
- pixel[0]=(unsigned char) (gamma*QuantumScale*GetPixelRed(p));
- pixel[1]=(unsigned char) (gamma*QuantumScale*GetPixelGreen(p));
- pixel[2]=(unsigned char) (gamma*QuantumScale*GetPixelBlue(p));
+ if (GetPixelRed(p) > 0)
+ pixel[0]=(unsigned char) (gamma*QuantumScale*GetPixelRed(p));
+ if (GetPixelGreen(p) > 0)
+ pixel[1]=(unsigned char) (gamma*QuantumScale*GetPixelGreen(p));
+ if (GetPixelBlue(p) > 0)
+ pixel[2]=(unsigned char) (gamma*QuantumScale*GetPixelBlue(p));
pixel[3]=(unsigned char) (exponent+128);
}
if ((image->columns >= 8) && (image->columns <= 0x7ffff))
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