Merge pull request #11565 from alalek:issue_11545

diff --cc modules/imgcodecs/src/loadsave.cpp
Simple merge

diff --cc modules/imgcodecs/test/test_grfmt.cpp
index 8fcbc1c,9bcb232..70b2f27
--- 1/modules/imgcodecs/test/test_grfmt.cpp
--- 2/modules/imgcodecs/test/test_grfmt.cpp
+++ b/modules/imgcodecs/test/test_grfmt.cpp
@@@ -335,6 -326,19 +335,20 @@@ TEST(Imgcodecs_Pam, read_write
      remove(writefile.c_str());
      remove(writefile_no_param.c_str());
  }
 +#endif
  
+ TEST(Imgcodecs, write_parameter_type)
+ {
+     cv::Mat m(10, 10, CV_8UC1, cv::Scalar::all(0));
+     cv::Mat1b m_type = cv::Mat1b::zeros(10, 10);
+     string tmp_file = cv::tempfile(".bmp");
+     EXPECT_NO_THROW(cv::imwrite(tmp_file, cv::Mat(m * 2))) << "* Failed with cv::Mat";
+     EXPECT_NO_THROW(cv::imwrite(tmp_file, m * 2)) << "* Failed with cv::MatExpr";
+     EXPECT_NO_THROW(cv::imwrite(tmp_file, m_type)) << "* Failed with cv::Mat_";
+     EXPECT_NO_THROW(cv::imwrite(tmp_file, m_type * 2)) << "* Failed with cv::MatExpr(Mat_)";
+     cv::Matx<uchar, 10, 10> matx;
+     EXPECT_NO_THROW(cv::imwrite(tmp_file, matx)) << "* Failed with cv::Matx";
+     EXPECT_EQ(0, remove(tmp_file.c_str()));
+ }
+ 
  }} // namespace