Most programs don make very good GIFs from 24-bit images. What about Opal?
Opal’s GIF image generation is optimized for the most accurate and faithful color representation of your images. Since Opal’s specialty is the creation of 24-bit special effects, images will typically contain many subtle shades of color. To properly handle this, Opal uses extremely high-performance proprietary color palette generation and dithering technologies that result in the highest possible quality output. Many times, the results are so fine that it is difficult or impossible to to tell an 8-bit GIF render result from a 24-bit image without enlarging an image.