@cornerstonejs/core/dist/esm/utilities/convertToGrayscale.js

Cornerstone3D Core

export default function convertToGrayscale(scalarData, width, height) {
    const isRGBA = scalarData.length === width * height * 4;
    const isRGB = scalarData.length === width * height * 3;
    if (isRGBA || isRGB) {
        const newScalarData = new Float32Array(width * height);
        let offset = 0;
        let destOffset = 0;
        const increment = isRGBA ? 4 : 3;
        for (let x = 0; x < width; x++) {
            for (let y = 0; y < height; y++) {
                const r = scalarData[offset];
                const g = scalarData[offset + 1];
                const b = scalarData[offset + 2];
                newScalarData[destOffset] = (r + g + b) / 3;
                offset += increment;
                destOffset++;
            }
        }
        return newScalarData;
    }
    else {
        return scalarData;
    }
}