This paper discusses issues with the limited precision of hardware texture-based volume visualization. We will describe the compositing OVER operator and how fixed-point arithmetic affects it. We propose two techniques to improve the precision of fixed-point compositing and the accuracy of hardware-based volume visualization. The first technique is to perform dithering of color and alpha values. The sedond technique we call exponent-factoring, and captures significanly more numeric resolution than dithering, but can only produce monochromatic images.