[sdiy] 12 bits D/A converter?

[labolida]

Thanks Mattias, i'll do it..!
cheers
---------- Cabeçalho original -----------

De: navelludd at gmail.com
Para: "labolida" labolida at terra.com.br
Cópia: "synth-diy" synth-diy at dropmix.xs4all.nl
Data: Fri, 13 Jul 2007 12:52:46 +0200
Assunto: Re: [sdiy] 12 bits D/A converter?

> On 13/07/07, labolida <labolida at terra.com.br> wrote:
> > > >
> > > > I'm currently working in a digital synth  http://www.sdiy.org/labolida/
> > >
> > > Is the sound guaranteed to have as much alias noise as those pictures? ;-)
> > >
> > Hi Mattias, you are right..! I shamed :-(
> > I just have put a better pictures in the page.
> 
> They still look the same.
> 
> The problem is that browsers (for some extremely stupid reason) never
> resize pictures properly, they just throw away pixels - thereby
> introducing lots of alias noise, just like when downsampling a sound
> file without anti-alias-filtering it first. Mathematically speaking,
> the highest room frequencies (which there is a lot of) in the picture
> get folded back into lower room frequencies with the new Nyquist room
> frequency. It gives graphics jagged edges, and in photos it tends to
> turn up as very strong annoying noise. This makes even the nicest
> synths look awful. :'-(
> 
> The solution is (and this goes to all webby SDIYers out there!) to
> NEVER let a browser resize an image. Which means, never use the
> 'width' and 'height' attribute of the <img> HTML tag (like it is done
> with the 'width="450" ' in these pages).
> 
> The only good use of 'width' and 'height' is to enter the true picture
> dimensions, i.e. to NOT resize it. Then the browser can draw the
> correct page disposition directly before loading all the pictures, and
> the contents is not moved around while loading. But it's easy to get
> these dimensions a bit wrong by mistake, giving an ugly picture...
> 
> So, what to do with the 10megapixel image to get it small enough for
> the web page? Resize it in a decent image program first. A browser is
> definitely not one of them. :-)
> 
> Good luck!
> 
> /mr
> 
>