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.
Eric LaMar, Eric LaMar,
"On issues of precision for hardware texture-based volume visualization", Proc. SPIE 5295, Visualization and Data Analysis 2004, (4 June 2004); doi: 10.1117/12.539257; https://doi.org/10.1117/12.539257