Re: [pygame] Best way to darken an area

["Lenard Lindstrom" <len-l@xxxxxxxxx>]

On 21 Oct 2006 at 14:49, Lenard Lindstrom wrote:

> On 21 Oct 2006 at 14:15, Farai Aschwanden wrote:
> 
> > Hello all
> > 
> > Anyone of you is experienced in darkening an area from daytime to  
> > nighttime?
> > 
> > - Alpha filter?
> > - Setting image pixels to darker value?
> > - ???
> > 
> > I couldn't find anything affecting contrast in Pygame that would help  
> > either.
> > 
> > Any ideas are welcome.
> > 
> To fade an image to black repeatedly alpha blit it with an all-black
> image having a small alpha value like 1. In fact - I have only just
> tried it - this should work as general way to fade from one image
> to another. So you can fade from a daytime to a nighttime image.
> 
Actually I was too quick to post. The general case of fading from one
image to another does not work (my test program blitted to a white 
background). But the fade-to-black does.

Lenard Lindstrom
<len-l@xxxxxxxxx>