gistfile1.m

    uint16_t *remapped = (uint16_t*) malloc(width * height * sizeof(uint16_t));
    vImage_Buffer src = {imgData,
                         (vImagePixelCount) height,
                         (vImagePixelCount) width,
                         bytes_per_row
                        };
    vImage_Buffer dst = {remapped,
                         (vImagePixelCount) height,
                         (vImagePixelCount) width,
                         bytes_per_row
                        };

    double max_intensity = pow(2, bits_allocated);
    vImageEndsInContrastStretch_PlanarF(&src, &dst, NULL, 10, 10, 1000, 0,
                                        max_intensity, kvImageNoFlags);