From 3e10f7c3c9f0394dfd6ebd372bc34a172dabc8ff Mon Sep 17 00:00:00 2001 From: Cristy 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))