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http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt
--- src/highgui/grfmt_png.cpp
+++ src/highgui/grfmt_png.cpp
@@ -223,7 +223,7 @@
png_set_palette_to_rgb( png_ptr );
if( m_color_type == PNG_COLOR_TYPE_GRAY && m_bit_depth < 8 )
- png_set_gray_1_2_4_to_8( png_ptr );
+ png_set_expand_gray_1_2_4_to_8( png_ptr );
if( CV_MAT_CN(m_type) > 1 && color )
png_set_bgr( png_ptr ); // convert RGB to BGR
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