[poppler] Pdf-transparency.

Lukasz Kwestarz Lukasz.Kwestarz at stazysta.comarch.com
Tue Aug 23 05:57:54 PDT 2005

Ok I have to use gs operator to make my box transparency. But when I put this (part of code in bold):

<</Type /Page
/Contents 31 0 R
/Parent 30 0 R
/Resources <<
/ExtGState <<
/AlphaOn 25 0 R
/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]
/Font <<
/F4 4 0 R
/Shading <<
/Sh2 2 0 R
/Sh5 5 0 R
/XObject <<
/MediaBox [0 0 595. 842.]

in the pdf file the colors are darker than before. I have a couple object that do not use the gs operator
and they are darker than before. That is why I wrote that i did not have to use the gs. I have to use it when i want to have a transparency, byt when i put /ExtGState... in pdf file the colors are darker. I use the shading in this pdf too. Maybe that is the reason?? Maybe soneone have the pdf with transparency and other objects??

Anyone know the reason??

  ----- Original Message ----- 
  From: Leonard Rosenthol 
  To: Lukasz Kwestarz ; Pdf-Help 
  Sent: Tuesday, August 23, 2005 2:08 PM
  Subject: Re: [poppler] Pdf-transparency.

  At 03:43 AM 8/23/2005, =?iso-8859-2?Q?=A3ukasz_Kwestarz?= wrote:

    I want to implement transparency in Pdf file, but i have to do it manual, without using ang software.


    I try to use /ExtGState but it applays to everything on the page. Is there anyone who can help my in this. 

          An ExtGState is attached to a page because it's a resource for that page - just like a font or colorspace.   HOWEVER, like a font, it's only used when you apply the relevant operator.

    This is the Page object with Resources and Alpha definitions.

          Looks fine.

    When I want to applay the alpha i use gs operator.


    The worst think is that i do not have to use gs operator,

          Yes, you have to!  How else will the viewer know when to use apply the state?


  Leonard Rosenthol                            < mailto:leonardr at pdfsages.com>
  Chief Technical Officer                      < http://www.pdfsages.com>
  PDF Sages, Inc.                              215-938-7080 (voice)
                                               215-938-0880 (fax)
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