我為此使用了 opencv4nodejs 和 nodejs，我正在嘗試獲取圖像 RGB 值并替換特定索引中的特定 RGB 值并創建一個二維數組。const color_map = [[255,255,0], [255,0,0], [0,255,255], [0,255,0], [0,0,0]];const input_image = cv.imread("Data/IMG/train_labels/0.png");let index = 0function form_2D_label(mat) {    const image = mat.cvtColor(cv.COLOR_BGR2RGB);    const imageBuffer = mat.getData();    const ui8 = new Uint8Array(imageBuffer);    const imageData = new Array((image.rows * image.cols))    for (let i = 0; i < ui8.length; i += 3) {        imageData[index] = [ui8[i], ui8[i + 1], ui8[i + 2]];        for (const [index, element] of color_map.entries()) { // enumerate color map             // console.log(index, element);             // I am trying todo if imageData[index] value = [255, 255, 0] as 0, if [255, 0, 0] as 1, if [0, 255, 255] as 2 like this..        }        console.log(imageData[index]) // [255, 255, 0] / [255, 0, 0] like this        index++;    }    return imageData;}const test = form_2D_label(input_image);console.log(test);電流輸出[[ 0, 0, 0 ], [ 255, 0, 0 ], [ 0, 0, 0 ], [ 255, 0, 0 ], [ 0, 0, 0 ],[255, 255, 0]]預期的一個[[ 4, 1, 4, 1, 4, 0 ]]