Could you share your 2 bpp workaround? . . . Will it work for raw image
data if I specify something like the following:
// 2-bit logic (0 black 3 white/transparent)
int transparency[] = {3, 3};
pdfImage =
com.lowagie.text.Image.getInstance(xSize,ySize,1,2,data,transparency);
Of course this presumes I transfrom the bilevel image data to 2-bit . .
. which would be better than 8 bit!
Thanks,
Jerold Sampson
Paulo Soares wrote:
> Bilevel images with color key masking don't work in Acrobat. I have a
> workaround in gif images to use 2 bpp instead of 1 bpp if transparency is
> present. Either you raise the bpp or you include a full image mask. You can
> create a black image 1x1 pixel and use your real image as image mask.
>
> Paulo
>
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On
>> Behalf Of Jerold Sampson
>> Sent: Thursday, November 09, 2006 4:45 PM
>> To: itext-questions@lists.sourceforge.net
>> Subject: Re: [iText-questions] Image transparency issues
>> related to printing PDF
>>
>> That addresses the PostScript issue . . . Level 2 does not
>> and can not
>> work! I can
>> live with that since very few of the huddled masses actually
>> use PostScript.
>>
>> However, regarding non-PostScript print drivers, which are in
>> the vast
>> majority, the
>> question still remains. . . . Why does transparency work for
>> 8-bit but
>> not bi-level?
>>
>> When you send a PDF out into the ether it is not realistic to assume
>> that the receiver has
>> the wherewithal to figure out how to select print as image! This may
>> sound ridiculous to
>> all us computer geeks but it is the reality!
>>
>> Is there some architectural reason why transparency doe not work for
>> bi-level image?
>> Have I coded the transparency specification incorrectly? Or
>> is this just
>> an artifact of the Adobe Reader?
>>
>> The workaround is it to use 8-bit instead of bi-level because
>> transparency appears to work with
>> 8-bit but not bi-level printing. However, that increases
>> the size of
>> the PDF
>> which is not an ideal result. The answer may remain the same, "live
>> with it!" but
>> thought I would ask.
>>
>> Thanks for the help.
>>
>> Sincerely,
>> Jerold Sampson
>>
>> Paulo Soares wrote:
>>
>>> This problem has nothing to do with iText. Only PostScript Level 3
>>> supports transparency (and all the other printer drivers
>>>
>> not postscript
>>
>>> based). You already have the solution, print to a PostScript Level 3
>>> printer, and the workaround, print as image.
>>>
>>> Paulo
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: [EMAIL PROTECTED]
>>>> [mailto:[EMAIL PROTECTED] On
>>>> Behalf Of Jerold Sampson
>>>> Sent: Thursday, November 09, 2006 3:22 PM
>>>> To: itext-questions@lists.sourceforge.net
>>>> Subject: Re: [iText-questions] Image transparency issues
>>>> related to printing PDF
>>>>
>>>> I tried setting the PDF version but it has no effect on
>>>>
>> this problem.
>>
>>>> Thanks.
>>>>
>>>> Jerold Sampson
>>>>
>>>> porcupine wrote:
>>>>
>>>>
>>>>> Have you tried setting the PdfVersion? eg (java):
>>>>>
>>>>> writer.setPdfVersion(PdfWriter.VERSION_1_3);
>>>>>
>>>>> set this before you do document.open();
>>>>>
>>>>>
>>>>>
>>>>> Jerold Sampson wrote:
>>>>>
>>>>>
>>>>>
>>>>>> I am having problems printing PDF generated with iText.
>>>>>>
>>>>>>
>>>> The PDF views
>>>>
>>>>
>>>>>> correctly with the Adobe reader but must be printed using
>>>>>> PostScript Level 3 or as image. The default printing
>>>>>>
>>>>>>
>>>> modes result in
>>>>
>>>>
>>>>>> image transparency issues, i.e. overlapping images obscure each
>>>>>> other. I have treid many different permutations but can
>>>>>>
>>>>>>
>>>> not seem to get
>>>>
>>>>
>>>>>> around the problem. I am attaching a sample PDF file
>>>>>> stripped down to the offending page content. It views
>>>>>>
>>>>>>
>>>> fine but prints
>>>>
>>>>
>>>>>> incorrectly unless it is printed as image or
>>>>>> PostScript Level 3.
>>>>>>
>>>>>> I am nor clear on how to set the transparency mask and
>>>>>>
>>>>>>
>>>> have been using
>>>>
>>>>
>>>>>> more or less a trial and error method! . . . not my preferred
>>>>>> mode of operation. My lack of understanding on how this
>>>>>>
>>>>>>
>>>> parameter is
>>>>
>>>>
>>>>>> constructed and what it does may be the source of my problems.
>>>>>> The following code snippets are used to add the images
>>>>>>
>> to the page:
>>
>>>>>> if (gray) {
>>>>>> // 8-bit logic (0 black 255 white/transparent)
>>>>>>
>>>>>> int transparency[] = {255, 255};
>>>>>> pdfImage =
>>>>>>
>>>>>>
>>>>>>
>> com.lowagie.text.Image.getInstance(xSize,ySize,1,8,data,transparency);
>>
>>>>
>>>>
>>>>>> }
>>>>>>
>>>>>> the above views correctly and prints fine to
>>>>>>
>>>>>>
>>>> non-PostScript devices . .
>>>>
>>>>
>>>>>> . However when printing to PostScript Level 2 it fails.
>>>>>>
>>>>>>
>>>> (I use CutePDF
>>>>
>>>>
>>>>>> driver to test this)
>>>>>>
>>>>>> else {
>>>>>> // 1-bit logic (0 black 1 white/transparent)
>>>>>> //int transparency[] = {1, 1}; // does not work
>>>>>>
>>>>>>
>>>> ??? (does not
>>>>
>>>>
>>>>>> view or print correctly)
>>>>>> int transparency[] = {255, 255}; // views but
>>>>>>
>>>>>>
>>>> must print as
>>>>
>>>>
>>>>>> image
>>>>>> pdfImage = new
>>>>>>
>>>>>>
>>>> com.lowagie.text.ImgRaw(xSize,ySize,1,1,data);
>>>>
>>>>
>>>>>> pdfImage.setTransparency(transparency);
>>>>>> }
>>>>>>
>>>>>> The above views correctly but must be printed as image or
>>>>>>
>>>>>>
>>>> PostScript
>>>>
>>>>
>>>>>> Level 3. The transparency[] = {1,1; does not work as it should.
>>>>>>
>>>>>> I am attaching two 1 page PDFs. One is a bi-level image
>>>>>>
>>>>>>
>>>> the other is
>>>>
>>>>
>>>>>> 8-bit.
>>>>>>
>>>>>> This may be an Adobe reader issue but I would like to make
>>>>>>
>>>>>>
>>>> sure there is
>>>>
>>>>
>>>>>> not something
>>>>>> else lurking around this problem!
>>>>>>
>>>>>> Thanks.
>>>>>>
>>>>>> Sincerely
>>>>>> Jerold Sampson
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>> --------------------------------------------------------------
>>>> -----------
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>>>>
>>>>
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>>> Get stuff done quickly with pre-integrated technology to
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>
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> Aviso Legal:
> Esta mensagem é destinada exclusivamente ao destinatário. Pode conter
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> desta mensagem não significa a perca de confidencialidade. Se esta mensagem
> for recebida por engano, por favor envie-a de volta para o remetente e
> apague-a do seu sistema de imediato. É proibido a qualquer pessoa que não o
> destinatário de usar, revelar ou distribuir qualquer parte desta mensagem.
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> Disclaimer:
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> confidential or legally protected information. The incorrect transmission of
> this message does not mean the loss of its confidentiality. If this message
> is received by mistake, please send it back to the sender and delete it from
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> intended receiver to use, distribute or copy any part of this message.
>
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