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Old 28-06-2015, 06:17 PM
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Atmos (Colin)
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Join Date: Aug 2011
Location: Melbourne
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My understanding is that it doesn't really increase "resolution". What happens is that you just get the most out of the resolution you're working with when you drizzle. When you drizzle what happens is that you smooth out some of the imperfections, tightening up stars (reducing airy disk a little) which allows you to see more BUT this isn't increasing resolution.

Resolution is the ability to resolve individual stars from one another, seeing fine detail in structure. Even when you are doing a 1x1 bin, if you drizzle that you'll help as well.

Basically, drizzling increases the SNR and helps sharpen up the image. This is why it appears to increase the resolution, because it does definitely improve the image. Once you lose resolution though, that can NEVER be reclaimed.
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