[scribus] White versus transparent pixels question

[Marco]

I'm sorry, my answer in this phase is "I don't exactly" as I need to
create a sample file to ask for some offers.
What is given is the paper to be used, a colored facsimile of old time
paper (rough, thick, etc ).
Generically speaking any typographical device that can print in white on
this support is a potential candidate for me.
I'm really not a professional in this field, just the standard IT guy
with some friends needing support for a no profit organization....

I have been exploring the problem a little bit today, and my
understanding so far is that there is somewhere in the code an "IF
pixel_color = page_color THEN skip ELSE send_to_output" than cannot be
bypassed. If this is true (?) I can put in the output all the colored
pixels of an image by choosing as page_color a color not used in my
document. I'm not sure of this, it is just my current hypothesis.

Il 24. 04. 16 20:45, Vladimir Savic ha scritto:
> This is actually one quite interesting question. You haven't told us the
> most important thing and that is - how do you plan to print that material.
> What equipment is involved in printing process? We have to start from there.
>
> On Sun, Apr 24, 2016, 20:08 Marco <marco.brignoli at marcobaldo.ch> wrote:
>
>> I'm a new and really happy user of Scribus. It works like a charm with a
>> few hours of self-learning, supported by the nice on-line documentation.
>>
>> I have just a problem I can't solve with a document containing an image
>> having a white object on a transparent background (and some yellow text).
>> As the final result of my work has to printed on not-white paper all the
>> white pixels of this image will have to be in the output (printer or ps
>> file).
>> Currently the white pixels are discarded, I can see this in the preview
>> of the print menu with the transparency option enabled, as the white
>> pixels are shown as they would be transparent. By changing the white
>> pixels to any other color this problem disappears.
>> Can anyone please be so kind as telling me how I can have also the white
>> pixels explicitly in my output? It is maybe trivial, but I could not
>> find the appropriate switch....
>>
>> Tnx in advance for your help.
>>
>> Marco
>>
>>
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