Integrated PDF (CMYK) JPEG file

Hello

As I understand it the PDF specifications it is possible to directly include a JPEG file in a PDF.

It must be encapsulated in an XObject object and its filter must be set to DCTDecode.

(Even the JPEG header and others stored in the final PDF file)

So I wrote a litte program PDFL Adobe that create these files by, basically, it reads all of the JPEG file using an ASStm [ASFileStmRdOpen()] which is called by the [PDEImageCreate()].

I put in the call to Create() that the stream is encoded.

Of course, it creates the appropriate PDEColorSpace in parallel.

In the end it all works in RGB, I get the expected result.

But when I use the CMYK JPEG file, the PDF I get is the negative of the image (as if I have applied time-> invert in Photoshop). I missed something for CMYK files?

Below are the links to download the test files and the result:

-CMYK (JPG) http://dl.free.fr/h2jecWBpj (PDF) http://dl.free.fr/gv5zecOEp

-RGB (JPG) http://dl.free.fr/nccbrL1mg (PDF) http://dl.free.fr/ho5kqmkD4

Thanks for the help.

Post edited by: blvd4

You probably forgot to detect that the JPEG image has been created by Photoshop that did reverse CMYK and requires a decoding table.  IIRC there is a note about this in the ISO 32000 document

Tags: Acrobat

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