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--- src/ZoneMinder-1.30.4/src/zm_image.cpp 2017-06-17 04:20:45.808503543 -0300
+++ src/ZoneMinder-1.30.4/src/zm_image.cpp.2 2017-06-17 04:20:40.221794330 -0300
@@ -1659,7 +1659,7 @@
uint8_t *psrc = images[j]->buffer+c;
#ifndef SOLARIS
- if ( (unsigned)abs((*psrc)-RGB_VAL(ref_colour,c)) >= RGB_VAL(threshold,c) )
+ if ( (unsigned)fabs((*psrc)-RGB_VAL(ref_colour,c)) >= RGB_VAL(threshold,c) )
#else
if ( (unsigned)std::abs((*psrc)-RGB_VAL(ref_colour,c)) >= RGB_VAL(threshold,c) )
#endif
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