Yes; I scaled up the iterations from 150 to 500 per pixel, and increased the resolution of the image from 500x120 px to 2048x1536 px. GDLib is not a very fast platform for fractal rendering, so it took around 2-3 minutes to render it on my Q6600. The Zelaron server requires an approximately 8 times longer time span to render my signature than my desktop system does. The same time factor seems valid for larger images. With a faster algorithm created in C++, I think the rendering time could be scaled down to a few seconds on my home system.

On another note, I think that both Fractal eXtreme and Xaos use fast multi-core algorithms for fractal rendering. I haven't been able to output huge images with them yet though, but I haven't really looked closely either.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram