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Hi Nihad,

if i understand you correctly you want to downscale the first image in your image array from 256x256 to 100x100.

Then you can use the cv::resize method.

// downscale image
cv::Mat dst;
cv::resize(image[0], dst, cv::Size(100,100));

// write image to png file
cv::imwrite("image/test.png", dst);