js-dicom/src/ImageUtility/getMinMax.js

this is js-dicom

function getMinMax (storedPixelData) {
    // we always calculate the min max values since they are not always
    // present in DICOM and we don't want to trust them anyway as cornerstone
    // depends on us providing reliable values for these
    let min = storedPixelData[0];
    let max = storedPixelData[0];
    let storedPixel;
    const numPixels = storedPixelData.length;

    for (let index = 0; index < numPixels; index++) {
        storedPixel = storedPixelData[index];
        min = Math.min(min, storedPixel);
        max = Math.max(max, storedPixel);
    }

    return {
        min,
        max
    };
}

export default getMinMax;