pass the correct rgb->gray coefficients to PNG decoder, to match cvtColor's.

14 years ago · beee6f2f70
parent d6686240d5
commit beee6f2f70
1 changed files with 1 additions and 1 deletions
--- a/modules/highgui/src/grfmt_png.cpp
+++ b/modules/highgui/src/grfmt_png.cpp
@ -230,7 +230,7 @@ bool  PngDecoder::readData( Mat& img )
            else if( color )
                png_set_gray_to_rgb( png_ptr ); // Gray->RGB
            else
-                png_set_rgb_to_gray( png_ptr, 1, -1, -1 ); // RGB->Gray
+                png_set_rgb_to_gray( png_ptr, 1, 0.299, 0.587 ); // RGB->Gray

            png_read_update_info( png_ptr, info_ptr );