You can use the Levels and Curves features to adjust a bitmap's tonal range. With Levels, you can correct bitmaps that contain a high concentration of pixels in the highlights, midtones, or shadows. Or you can use Auto Levels and let Fireworks adjust the tonal range for you. If you want more precise control over a bitmap's tonal range, you can use the Curves feature, which lets you adjust any color along the tonal range without affecting other colors.