[magick-users] problem with compose=>'CopyOpacity'

[Günter Bachelier]

Hello Anthony,

 > But is that the way to turn off alpha channel in Magick++?

no I am using still PerlMagick,
http://www.vi-anec.de/Trance-Art/IM-examples/p3m1_extraction/Test_p3m1_extraction.PLX
and Set(matte=>'false') is  working with gray scale images
that were read but here a mask is generated within IM. I suspect
that Set(size=>"$w x $h") is generating a RGB image by default
so I also tried Quantize(colors=>2, colorspace=>'Gray') but
the image after compose remains also unchanged.
I also tried an other kind of compose  ('in') with transparent
background and a white hexagon but it did not work either.
I really don't what went wrong here; I used 'CopyOpacity' and
'in' many times the same way.


Guenter






| Hello,
| 
| why remains $mask after compose=3D>'CopyOpacity' unchanged?
| 
| $extraction_mask->Set(matte=3D>'false'); # $extraction_mask =3D white =
| 
But is that the way to turn off alpha channel in Magick++?

If this is not turning off the alpha channel, then CopyOpacity
will not do what you expect.

Please try this on a image with transparency, and see if the result
still have transparency or not.

I am just not familiar with Magick++, only with Command line and the
core Magick Library.