If you want large flame fractals (eg. >2000 pixels wide) then you won't be able to render them to disk. If you have enough memory on your PC, and the fractal concerned is single-layer then you should be able to produce a large version in UF itself and then export the image - I have 256Mb of RAM and have done this with a 3 layer image at 4000*3000, though it wasn't a flame fractal. If you want to try this you need to change UF's maximum allowable internal rendering size in the options.

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