maybe i am casting pearls?

"Pete D" <dont.use@email.to.reply> wrote in message
news:jXlnc.29162$TT.19275@news-server.bigpond.net.au...
> Wonderful.
>
> So what?
>
> "bagal" <alan_plc@hotmail.com> wrote in message
> news:O74nc.78$Nc3.32@newsfe3-win.server.ntli.net...
> : Hi I am new here and am looking for a discussion forum to sound out some
> : preconceptions I have about digital imaging.
> :
> : 1 - pixels have finite dimension (whatever it may be on PDA, computer or
> : large screen display a sports ground)
> : implication:
> : (a) digital image resolution is best optimised on a 1 to 1 basis
> : therefore aiming for 6x4 or 7x5 prints with mucho megapixels is really a
> bit
> : of over the top-ness
> :
> : (b) digital signal processing (in essence maths algorithms) are
essential
> if
> : image reproduction move from a 1-2-1 display.  Why?  Well, if showing a
> 2000
> : by 1000 images on a display of 4000 by 2000 either the pixels have to be
> : 'enlarged'  to fill 2 pixel places along and 2 pixel places up.  So in
> this
> : example 1 ordinary pixel now fills the space of 4 ordinary pixels  (I
bet
> : this is what is called pixellation)
> :
> : (b2) maybe there is another way - let's call it interpolation.  Instead
of
> 1
> : image pixel filling the space taked by 4 display pixels we'll use a bit
of
> : linear math to fill in the bits in between.  So the original image
pixels
> : now fill 1 display pixel space but they are surrounded by fill-in values
> : determined by a linear math algorithm.
> :
> : (c) going the other way, from a 2000 by 1000 image to a 300 by 200
> display.
> : Now we have far too many pixels in the image Rougly 5 times too many  So
> the
> : display shows 1 pixel from the image, discards the next 4 image pixels
and
> : so on ...  till the display space is filled.
> :
> : OK - what am I getting at?
> :
> : Well, the first thing is the importance of a bit of linear math,  Image
> : processing algorithms seem pretty darned important.
> :
> : Then there are interference effects.  Remember all thos lovely patterns
> : generated by repeating certain equations again, again and again (it used
> to
> : be called chaos or fractal math)  Well, there is a possibility that
> : particular image patters might generate interference
> :
> : To me - speaking naively - this suggests that tonal as opposed to colour
> : display of images is the kernel of a good CCD.  Can it handle tonal
> : variation as well as changes in hue and colour?
> :
> : ?
> :
> : the bagal
> :
> :
>
>