Re: adding noise to an image

[Paul Davis <pjdavis engineering uiowa edu>]

Foster, Gareth wrote:

> > > uint8 * p_buf = get_buf_blah_pseudo();
> > > uint8 by_val = rand()%std::numeric_limits<uint8>::max_val;
> > > std::fill(p_buf, p_buf + 3, by_val);
> > >
> > >      
>
> [ snip ]
>
>  
>
> > If I'm not mistaken, that would create an image of one pixel value.
> >
> >    
>
> I meant ...
>
>  // up front ...
>  uint8 * p_buf = get_buf_blah_pseudo();
>
>  // ... then later, per pixel ...
>  uint8 by_val = rand()%std::numeric_limits<uint8>::max_val;
>  std::fill(p_buf, p_buf + 3, by_val);
>
>
> It was just meant to illustrate the statement about settings rgb to the same
> values.
>
> Nice tip on the 'randomness' btw, cheers.
>
> Gaz
>  
Ahhh, lol.

I completely wasn't paying attention to the limits of the filling.  I 
just realized that was only putting by_val in 3 values, not the entire 
image.

My bad.

But that'd still give you an image of noise, its not an alterative 
process, its difinitive.  I mean, that would give you a picture of tv 
snow, not a picture of grandma that looked like it had been taken with a 
bad camera which as I understood it was the idea.

Damn stl algorithms.....
Paul