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Planetary images are usually only about 200 pixels across the planet, so blowing them up to a reasonable size in a book is essential. I use 3x drizzle when stacking, then increased these by 2x to give a reasonable pixels per inch value.
That being said, I increased the size of Mercury too far, and should have blown up the comet a bit more ... you never really know until you see it on the page.
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