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> Calling a gaussian blur “camera blur” or “defocus” (whatever the color space) is just inaccurate and confusing. Nonsense. When you defocus a camera, you get
by petewarden 17y ago
> Calling a gaussian blur “camera blur” or “defocus” (whatever the color space) is just inaccurate and confusing.
Nonsense. When you defocus a camera, you get an effect that's comparable with a gaussian blur performed in linear space. Blurring is a well-understood operation that's existed for a long time in the analog world, before we ever did any digital processing.
- jacobolus 17y agoWell, “comparable” insofar as you don’t care about the details, I suppose; you could also call a square or triangle blur kernel “defocus” if you wanted. A real lens blur doesn’t look much like a gaussian blur for someone who is familiar with both and paying attention. For explanation, see for instance http://en.wikipedia.org/wiki/Bokeh http://en.wikipedia.org/wiki/Bokeh
- petewarden 17y agoYep, my 'camera defocus' also included arbitrary kernel geometry as an option! I'm not trying to be obnoxious about this, but I really did spend five years of my life coding this stuff for Apple.