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Topic: DeviceRGB to DeviceCMYK
Conf: (P-PDF) Developers, Msg: 73221
From: shinevijayan
Date: 9/29/2002 05:56 PM


I have a bunch of PDF files which have images in it in DeviceRGB colorspace. Also images are compressed using DCTDecode and Flate Decode.

Now i want to convert the colorspace from DeviceRGB to DeviceCMYK,from within my custom plug-in (VC++ 6.0 /Win 98/2000) i tried using the conversion equation given in the PDF spec (6.2.3).

So, this is what i have understood, please advice me if i am right or wrong: for coverting an DeviceRGB image to DeviceCMYK i need to processing the RGB pixel and generate CMYK pixel using the conversion equation (PDF spec 6.2.3).

I have a couple of doubts here:

a) How do i use the BG2 and UCR2 in my C++ program to do the conversion from RGB -> CMYK?.

b) Or are there C++ equivalace to BG2 and UCR2 ?.

c) Or is there a way by which i don't need to convert the image pixel from RGB to CMYK and let Acrobat do that for me ?

Thanx in Advance,
Shine Vijayan

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