js-dicom/src/ImageUtility/colorSpaceConverters/convertYBRFullByPlane.js

this is js-dicom

export default function (imageFrame, rgbaBuffer) {
    if (imageFrame === undefined) {
        throw new Error('decodeRGB: ybrBuffer must not be undefined');
    }
    if (imageFrame.length % 3 !== 0) {
        throw new Error('decodeRGB: ybrBuffer length must be divisble by 3');
    }

    const numPixels = imageFrame.length / 3;
    let rgbaIndex = 0;
    let yIndex = 0;
    let cbIndex = numPixels;
    let crIndex = numPixels * 2;

    for (let i = 0; i < numPixels; i++) {
        const y = imageFrame[yIndex++];
        const cb = imageFrame[cbIndex++];
        const cr = imageFrame[crIndex++];

        rgbaBuffer[rgbaIndex++] = y + 1.40200 * (cr - 128);// red
        rgbaBuffer[rgbaIndex++] = y - 0.34414 * (cb - 128) - 0.71414 * (cr - 128); // green
        rgbaBuffer[rgbaIndex++] = y + 1.77200 * (cb - 128); // blue
        rgbaBuffer[rgbaIndex++] = 255; // alpha
    }
}