IMWRITE_TIFF_XDPI imwrite params dpi

[KFPA]

opencv 3.4.1-dev function imwrite params IMWRITE_TIFF_XDPI,IMWRITE_TIFF_YDPI do not work？

   Mat img = imread("C:\\Ursers\\r\\Desktop\\1.tif");
vector<int> vec;
vec.push_back(IMWRITE_TIFF_XDPI);
vec.push_back(300);
vec.push_back(IMWRITE_TIFF_YDPI);
vec.push_back(300);
imwrite("C:\\Users\\KFPA\\r\\4.tif", img, vec);

it does not work，why？

[saskatchewancatch]

It seems to work fine for me, with the baboon.tiff image that's in the opencv_extra repo's test data folder. I checked the written image with a TIFF tag viewer (Aware Systems TIFF Tag viewer) and with Windows' own file examiner and I see the DPIs I set.

Would you be able to upload your test image (1.tif) and the result image (4.tif)? It would help reproduce the issue so someone can debug.

[KFPA]

it is my fault,i forgot to update opencv dll.it can work now!thanks!!