Placing colored pixels next to each other

Hi folks,

I'm quite new with PIL and I'm trying to do something simple
but I'm  
having a hard time getting this to work the way I want.

What I want to do is place two different colored pixels next
to each  
other w/o one trampling over the other. I'm not quite sure
what's  
happening, or what to call it, maybe antialiasing, but lets
say I  
want to place a green pixel at 0,0.

Just setting one pixel to red doesn't make a red pixel at
all, it's  
rather grey. If I make a box (say 5x5) it's a bit better,
but the  
color isn't confined to the 3x3 box anymore .. there's a
"splatter"  
of coloring (of lower intensity) in the neighborhood of my
red box.

That's probably desirable in most cases, but I'm looking for
exact  
color hits ... eventually what I'd like is to have red and
green  
pixels next to each other w/o them interfering with their
neighbors.

I'm trying to visualize a 6000x200 matrix (in this case a
microarray)  
where each pixel would represent an index of the matrix ..
the  
different colors in each pixel would represent something
else.

Even if I make the image 18000x600 to do 3x3 pixels for each
"index",  
the red and greens still fight with eachother and I get a
nice grey  
smudge for an image.

Is there another approach I should be taking, or a setting I
can turn  
off so this doesn't happen?

Oh ... I'm using recently checked out svn version of PIL
(thanks for  
the numpy integration, btw) and am setting the mode of the
image to  
be RGB and RGBA (I'd like transparency to, eventually), for
the record.

Lastly, I apologize if I'm missing something obvious, looked
through  
the docs located at http:
//www.pythonware.com/library/pil/handbook/ 
index.htm but can't seem to make sense of it for what I need
to do.

Thanks,
-steve
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Steve Lianoglou wrote:

> What I want to do is place two different colored pixels
next to each  
> other w/o one trampling over the other. I'm not quite
sure what's  
> happening, or what to call it, maybe antialiasing, but
lets say I  
> want to place a green pixel at 0,0.
> 
> Just setting one pixel to red doesn't make a red pixel
at all, it's  
> rather grey. If I make a box (say 5x5) it's a bit
better, but the  
> color isn't confined to the 3x3 box anymore .. there's
a "splatter"  
> of coloring (of lower intensity) in the neighborhood of
my red box.

how are you setting the pixels, and what are you doing to
view the result ?

> I'm trying to visualize a 6000x200 matrix (in this case
a microarray)  
> where each pixel would represent an index of the matrix
.. the  
> different colors in each pixel would represent
something else.

6000x200?  are you sure the artifacts you're seeing isn't
caused by 
whatever program you're using to display the image?  or do
you really 
have a 6000-pixel wide screen?

</F>

_______________________________________________
Image-SIG maillist  -  Image-SIGpython.org
htt
p://mail.python.org/mailman/listinfo/image-sig

Steve Lianoglou wrote:

> What I want to do is place two different colored pixels
next to each  
> other w/o one trampling over the other. I'm not quite
sure what's  
> happening, or what to call it, maybe antialiasing, but
lets say I  
> want to place a green pixel at 0,0.
> 
> Just setting one pixel to red doesn't make a red pixel
at all, it's  
> rather grey. If I make a box (say 5x5) it's a bit
better, but the  
> color isn't confined to the 3x3 box anymore .. there's
a "splatter"  
> of coloring (of lower intensity) in the neighborhood of
my red box.

how are you setting the pixels, and what are you doing to
view the result ?

> I'm trying to visualize a 6000x200 matrix (in this case
a microarray)  
> where each pixel would represent an index of the matrix
.. the  
> different colors in each pixel would represent
something else.

6000x200?  are you sure the artifacts you're seeing isn't
caused by 
whatever program you're using to display the image?  or do
you really 
have a 6000-pixel wide screen?

</F>

_______________________________________________
Image-SIG maillist  -  Image-SIGpython.org
htt
p://mail.python.org/mailman/listinfo/image-sig