COLOR_RGB2BGRA   6700 modules/imgproc/src/color.cpp     case COLOR_BGR2BGRA: case COLOR_RGB2BGRA: case COLOR_BGRA2BGR:
COLOR_RGB2BGRA   6704 modules/imgproc/src/color.cpp         dcn = code == COLOR_BGR2BGRA || code == COLOR_RGB2BGRA || code == COLOR_BGRA2RGBA ? 4 : 3;