Simple code:
cv::Mat left_image = cv::imread(filename, cv::IMREAD_COLOR );
cv::cvtColor(mat, mat, cv::COLOR_BGR2GRAY);
cv::imwrite("dummy_gray_cv.png", left_image); // ok
QImage test((unsigned char*) left_image.data, left_image.cols, left_image.rows,
QImage::Format_Grayscale8);
test.save("dummy_gray_qt.png"); // skewed
However the dummy_gray_qt.png image is not aligned correctly, it's skewed as if
bytes are missing/being skipped.
I have to convert it back to color to work:
cv::Mat dst;
cv::cvtColor(left_image, dst, cv::COLOR_GRAY2BGRA);
QImage result = QImage((unsigned char*) dst.data, dst.cols, dst.rows,
QImage::Format_RGB32);
result.save("dummy_color_qt.png")
Is there a way I can avoid needing cv::cvtColor(left_image, dst,
cv::COLOR_GRAY2BGRA)?
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