Fractal Terrain Export issue concerning Rivers

Evening all! I'm having a bit of an issue when exporting my world as a sphere map image; no matter what resolution I'm working in in FT and what file type I export in, the rivers never show up with any clarity without a hefty amount of zooming. They appear to consistently export as one pixel wide strings of color. Granted, I am exporting it as a high width image to increase the resolution as it's a map my friend wants to run through some stuff in photoshop. Any ideas on a fix other than lowering the export resolution?
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