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List:       imagemagick-user
Subject:    Re: [magick-users] alpha channel ImageMagick and FPDF...
From:       "pere roca ristol" <peroc79 () gmail ! com>
Date:       2008-12-16 12:42:15
Message-ID: ffb5ec840812160442s3bdef130r348380c8b4ac9398 () mail ! gmail ! com
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  salut Pierre & other Magick people,

  TCPDF seems to work quite fine, thanks.

  Just for curiosity and learning, other people on the list suggested me to
use +matte (I'm using old versions of IM, 6.2.8). It causes my PNG to become
black/white (docs say: " it just turns off the transparency channel; saving
the image with the transparency data turned off, will not save any
transparency data to the image file format, and that data will be lost").

  I'm not sure if it's possible to "visually" keep the original PNG (with
colors) but without alpha channel (transparency)...

  best regards,
  Pere

2008/12/12 Pierre-Yves Landuré <py.landure@dorigo.fr>

> Hi,
>
> This is not related to imagemagick, but take a look at TCPDF :
>
> http://www.tecnick.com/public/code/cp_dpage.php?aiocp_dp=tcpdf
>
> It is a successor to FPDF, and it just recently began to support PNG alpha
> channel.
>
> As for the solution with FPDF, i don't really know, but TCPDF can help you
> , may be.
>
> Pierre-Yves Landuré
>
> pere roca a écrit :
>
>  dear all,
>> I have just moved from GD to imagemagick. i was using FPDF to incrustate
>> images generated from GD  in PDFs  but now it doesn't work with
>> imagemagick
>> ; it complains about alpha channel.
>>
>> FPDF doesn't support alpha channel. The strange thing is that it worked
>> for
>> GD, so I suppose that by default ImageMagick creates PNGs with alpha
>> channel. I have tried to remove it using  "convert 'file.png' -depth 0
>> 'no_alpha.png'" without success ("FPDF error: 16-bit depth not supported:
>> download/new2.png").
>>
>> So I'm wondering if I have to move to Ghostscript; someone knows if alpha
>> channel is supported there? is Ghostscript easy to work with?
>>
>> thanks!
>>
>> Pere
>>
>>
>
>


-- 
Pere Roca Ristol
Biòleg i especialista GIS
Museo Nacional de Ciencias Naturales (CSIC)
Visita l'EDIT mapViewer!
http://edit.csic.es/edit_geo/prototype/edit.html
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