Only simple textures should be used with the Flash Renderer. Ideally, there should be only two or three colors, no gradients, no anti-aliasing, and only simple images, such as a star.
If you have several pixels with different colors, the vector creation process (picture-to-Flash conversion) generates several regions. The file size is much larger than an .avi render.
The Flash Renderer takes the rendered picture and finds a uniform color region. The color must match perfectly; the Flash Renderer does not support color thresholds.
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