JPEG files embedded into PDF

Hi,
We know that the JPEG files suffer from a destructive process as we make changes to them and save the file several times; just the act of opening a JPEG file and saving it results in a loss of data and quality, due to its nature, right?! So, what I'd like to know is: does the JPEG files that are embedded into a PDF [like an ebook, for example] have the same behavior of loosing quality? I mean, in some cases we need to make changes on a PDF [creating notes, highlights, etc] and this demands saving the file over itself several times.
I have a lot of photography ebooks, but I'm afraid of creating notes on them because I don't wanna end up with a lot of ebooks with poor quality images after some time. Does anyone know if this proceeds? Thanks in advance.

I've yet to encounter the PDF that absolutely HAD TO BE high definition. Most I've read were license agreements, or tutorials, with "screenshots" at best. High def = big file size and the larger the PDF the more difficult it is to transfer (FTP or e-mail). You can put it on a site for download but if each person downloading it transfers 50-100Mb pretty soon you run out of bandwidth unless you own the server.
If your only use is personal and you're not worried about stroage space (I'm getting 4Tb later this month and it will no longer be an issue ) The by all means leave them "as is". Acrobat Pro does allow saving as "large files" to preserve "most of" the integrity of HD images, but the more you save a PDF the more images will degrade, to certain extent. Eventually they can't be compressed any more, and it will level off, but... it sounds like that's not something you'll like. I have a few freinds who are "photo buffs" and they can't stand any file degradation in their pics. It drives one girl up the wall when I "save for web" to put stuff on her site, but she understands that she can't take the 10-15mb hit every time someone opens a picture to view in her gallery.
Happy July 4th!

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JPEG file embedded in PDF (CMYK)

Hello,
As I understand the PDF Specifications it's possible to directly include a JPEG file in a PDF.
It has to be encapsulated into a XObject and its filter must be set to DCTDecode.
(Even the JPEG header and such get stored in the final PDF)
So I wrote a litte program using the Adobe PDFL that create such file, basically it reads the entire JPEG file using a ASStm [ASFileStmRdOpen()] which is called by the [PDEImageCreate()].
I set in the Create() call that the stream is encoded.
Of course it creates alongside this the appropriate PDEColorSpace.
In the end all of this works in RGB I get the intended output.
But when I use CMYK JPEG file, the PDF I get is the negative of the image (as if I applied Adjustements->Invert in Photoshop). Did I miss something for CMYK files ?
Below links to download the test files & 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.
Message was edited by: blvd4

I assume your talking about "Table 13 – Optional parameter for the DCTDecode filter" : ColorTransform.
If the encoding algorithm has inserted the Adobe-defined marker code in the encoded data indicating the ColorTransform value, then
the colours shall be transformed, or not, after the DCT decoding has been performed according to the value provided in the encoded data and the value of this dictionary entry shall be ignored.
So again if I understood correctly when Photoshop writes the jpeg file it sets the APP14 marker (described here : http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe) and isn't this flag sufficient for a PDF reader to make the appropriate conversion for correct CMYK output.
On a sidenote in libjpeg if this marker is present and considering its value and there is 4 components in the input file it sets the colorspace to YCCK. Is YCCK equals to inverted CMYK ?
Or is inverted CMYK flagged elsewhere in a JPEG file ?
I suppose Adobe Reader (the one I use on Linux) is a conforming reader that fully support the PDF specifications and reacts to marker in JPEG file format that in turn get stored in the stream of a XObject, am I wrong ?

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Thanks for the reply. I understand my wording was misleading.
What we are doing is taking a single page base PDF file, containing 10 elements for example, and using our own software (with help from iText) adding other page elements on the same page. Most of the time these elements are just text, or the odd image, but sometimes, we may be placing a PDF Logo on the same page. The resulting PDF seems to be a single page, containing 10+ elements of equal hierarchy, with no reference to the source PDF file that was used for the logo. Also looking at the Layers panel, There is no information here.
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