[cairo] Pixels Are Not Little Squares

Lawrence D'Oliveiro ldo at geek-central.gen.nz
Wed Jun 22 01:58:40 UTC 2016

I wrote:

> On Fri, 22 Apr 2016 13:22:19 -0700, Krzysztof Kosiński wrote:
>> The little square model is OK for Cairo, since it uses a box
>> filter...  
> Just in case there is any confusion over this point, the “box” shape
> for a filter is the shape in the frequency domain. In the sample
> domain, the dual of this is the sinc function, which looks nothing
> like a little square.

Hmm, maybe this depends on your interpretation of “box” ... the common
interpretation nowadays seems to apply to the shape in the sample

In which case, it’s not a filter you want to use for the original

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