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const cv = require('opencv');

cv.readImage('./test.jpg', function (err, img) {

if (err) {

throw err;

}

const width = im.width();

const height = im.height();

if (width < 1 || height < 1) {

throw new Error('Image has no size');

}

// do some cool stuff with img

// save img

img.save('./output.jpg');

});