bluring images

[Quixad�]

hi, folks
i have to make a script that blurs an image according to a custom slider. it�s for simulating the way lenses work on telescopes, putting things out and on focus. could it be done with imaging lingo? if so, could you please just point me the right direction? what kind of image property could achieve such thing? i must say that i�m not really familiar with imaging lingo.
thanks a lot in advance,
q


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