Re: [android-developers] camera: can I create star, diffraction (etc.) filters?

On Sun, Feb 05, 2012 at 06:22:18PM -0800, Romain Guy wrote:
> Emulating a polarizing filter properly will be very difficult. One of
> the most obvious effects of polarizing filters is increased contrast
> and color saturation. Polarizing filters are also used to reduce or
> eliminate various reflections in a scene: light bouncing of leaves,
> reflections in the water, etc.

:-)

Ok, yeah, of course, I do know what a polarizing filter is for. :-)
I've got a few of them in my camera bag (and have had, for about
30 years). :-)

What I don't know is if, perhaps, there was already a software
implementation (something that might detect glare similar to how an echo
canceller in voice telephony detects an echo in the outgoing audio and
injects the same signal, 180 deg. out of phase, to cancel it out) in
Mediastore or in Camera that I missed. No, I wouldn't try to implement a
polarizer myself...but if I missed that as existing library code..... So
I gather that I didn't miss it...it just isn't there (which I expected,
but had to at least ask).

What about a star filter or (and this is another one that I REALLY expect
the answer to be no for) a diffraction filter (maybe somehow simulating
the effects of a difraction grating via software...if that's even
possible)? I did see at least one example (Google search) of a
software-based star filter, but not for Android apps.

My goal here is to develop a camera app with the best combination of ease
of use and features I can manage. If some 35mm filters can't be done in
software, oh well. That's why we still use film for some projects (I
still love Kodak Ektar Pro 100 film...personal opinion, of course, not
employed by Kodak...or anyone, for that matter, thanks to cancer #1
putting me right out of the job market).

Right now, though, as I said, I'm spending enough time to (hopefully)
work through one chapter of the book[1] per day, and then fish on Google
and in the dev guide for links to references I can use when I actually
start on the app. In this case, I'm here because I didn't find them, and
I'm hoping that I just missed something for at least one of these filter
types. :-)

Thanks,
--jim

[1] Pro Android Media

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