[scribus] OT: Interesting Camera/Mega-Pixel Article

[John Culleton]

On Wednesday 11 March 2009 03:37:14 pm Jeffrey Silverman 
wrote:
> On Wed, Mar 11, 2009 at 3:21 PM, Asif Lodhi 
<asif.lodhi at gmail.com> wrote:
> > Hi Jeffrey,
> >
> > On 3/11/09, Jeffrey Silverman 
<jeffrey.d.silverman at gmail.com> wrote:
> >> <snip!> I also suspect many don't understand the
> >> difference between optical
> >>
> >>> and digital zoom.
> >>
> >> There is a difference?
> >
> > Optical zoom: zooming rotating the *physical* knob
> > around the lens. Digital zoom: mathematical estimation
> > (interpolation) of the next zoom level of image size.
> >
> > Correct me if I am wrong, please.
> >
> > -Asif
>
> Sorry, that was my EXTREMELY dry humor[1]. I actually
> know what the diff is. and yes, you are way wrong:
> optical zoom is when the lens diffraction rate is 0.5
> times the distance to the optical interference, resulting
> in noticeable noise, and digital zoom is when the lens is
> circumvented through reverse interpolation of the optical
> megapixels. Someone may be interested in expanding on
> some of the minor details, but that is a good overview.
>
>
>
>
>
> [1] as in "Not Actually Funny(TM)" or "Funny Not
> Included"
Optical zoom means moving the lens elements around, just as 
on a film camera.  I don't think this is a significant 
cause of noise, but of course it will vary from camera to 
camera. My Fujifilm E900 manual states that digital zoom 
lowers picture quality.  I have an add-on lens to avoid 
overuse of digital zoom. 



-- 
John Culleton
Able Indexers and Typesetters
http://wexfordpress.com