transparent images

Hello,
I am new to imagemagick and need to draw transparent circles
on an
existing image. I managed to do that using composite
function but i need
to draw circles.
I used the following syntax:

`convert -size $size xc:none -fill $fill_color -stroke
$border_color
-draw "circle $_[0],$_[1] $radius,$_[1]"
$$_circle.gif`;
        `composite -dissolve $dissolve -colorspace
transparent
$$_circle.gif
$$_$ARGV[0] -matte $$-out_$ARGV[0]`;

It would be a great help if i could straight away draw
transparent
circles using perlmagick cammands.

thanks

-- 
Nirali
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"nirali jivrajani" on  wrote...
| Hello,
| I am new to imagemagick and need to draw transparent
circles on an
| existing image. I managed to do that using composite
function but i need
| to draw circles.
| I used the following syntax:
| 
| `convert -size $size xc:none -fill $fill_color -stroke
$border_color
| -draw "circle $_[0],$_[1] $radius,$_[1]"
$$_circle.gif`;
|         `composite -dissolve $dissolve -colorspace
transparent
| $$_circle.gif
| $$_$ARGV[0] -matte $$-out_$ARGV[0]`;
| 
| It would be a great help if i could straight away draw
transparent
| circles using perlmagick cammands.
| 
| thanks
| 
You can not draw transparent circles!!!

It is like using an invisible paint on an image, nothing
happens.

What you want to do is 'cut out' a circle from an image.
See  Alpha Composition Dst_Out (or 'erase')
  http://www.cit.gu.edu.au/~anthony/graphics/im
agick6/compose/#dstout

In particular, see the draw a 'moon' example!

  Anthony Thyssen ( System Programmer )    <A.Thyssengriffith.edu.au>
 -----------------------------------------------------------
------------------
   The generation of random numbers is too important to be
left to chance.
                               -- Tom Christiansen
<tchristmox.perl.com>
   Anyone attempting to generate random numbers by
deterministic means is,
   of course, living in a state of sin.                   --
Von Neumann
 -----------------------------------------------------------
------------------
     Anthony's Home is his Castle     http://www.cit.gu.
edu.au/~anthony/
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