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Topic: Re: Detecting colored page
Conf: (P-PDF) Developers, Msg: 56851
From: LeonardR
Date: 5/29/2002 05:22 PM

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At 10:03 AM 5/10/2001 -0400, p-pdf-developer Listmanager wrote:
>On 5/10/2001 4:26:00 AM, aandi wrote:
> >A plug-in can analyse the
> >page, but it is a complex
> >decision - what is a colour
> >page? For instance, 100%
> >red+green+blue appears black.
>
>Yes you are right 100% Red+Blue+ Green is black and it should be
>interpreted as black image.

You misunderstood what Aandi was trying to tell you. He is trying
to express the fact that the definition of a "colored page" is extremely
vague - especially given the number of possible color spaces that PDF can
express.


>Is possible to detect the page type (colored or B&W) by first creating the
>image of the current page and then scanning that image to detect color
>(pixel by pixel) by using some api (Windows or Adobe).
You could certainly rasterize a PDF to a bitmap, then scan the
bitmap for pixels other than (0, 0, 0) and (FF, FF, FF) to determine color
- IF that is your definition of "colored" vs "black & white".

If you could tell us why you need to know this information, we
could perhaps help you approach the problem correctly.

And as to what API to use, that depends on how you plan to deploy
your solution. Will it be a desktop or server-based solution? What OS
platform(s) are involved? What development language(s) do you want to use?


LDR


--------------------------------------------------------------------------------------------------------------------------
Leonard
Rosenthol
Director of Software Development (215) 922-3509 (voice)
Appligent, Inc. (formerly Digital Applications) (610) 284-4233 (fax)

PGP Fingerprint: 8CC9 8878 921E C627 0BC1 15BB FC19 64A9 0016 1397

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At 10:03 AM 5/10/2001 -0400, p-pdf-developer Listmanager wrote:

On 5/10/2001 4:26:00 AM, aandi
wrote:

>A plug-in can analyse the

>page, but it is a complex

>decision - what is a colour

>page? For instance, 100%

>red+green+blue appears black.


Yes you are right 100% Red+Blue+ Green is black and it should be
interpreted as black image.


        You
misunderstood what Aandi was trying to tell you.  He is trying to
express the fact that the definition of a "colored page" is
extremely vague - especially given the number of possible color spaces
that PDF can express. 

        


Is possible to detect the
page type (colored or B&W) by first creating the image of the current
page and then scanning that image to detect color (pixel by pixel) by
using some api (Windows or Adobe).

        You
could certainly rasterize a PDF to a bitmap, then scan the bitmap for
pixels other than (0, 0, 0) and (FF, FF, FF) to determine color - IF that
is your definition of "colored" vs "black &
white". 


        If you
could tell us why you need to know this information, we could perhaps
help you approach the problem correctly.


        And as to
what API to use, that depends on how you plan to deploy your
solution.  Will it be a desktop or server-based solution?  What
OS platform(s) are involved?   What development language(s) do
you want to use?




LDR




--------------------------------------------------------------------------------------------------------------------------

Leonard
Rosenthol                                   
<mailto:leonardr@appligent.com>

Director of Software
Development                      
(215) 922-3509 (voice)

Appligent, Inc. (formerly Digital Applications) 
(610) 284-4233 (fax)



PGP Fingerprint: 8CC9 8878 921E C627 0BC1  15BB FC19 64A9 0016 1397



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