Question about PDF manipulation

[Dwight K. Elvey]

>From: "Jules Richardson" <julesrichardsonuk at yahoo.co.uk>
>
>On Thu, 2005-06-02 at 23:15 -0700, Eric Smith wrote:
>> Does any TIFF file of the nature you describe actually exist?  PDFs
>> with both bitmaps and text are not uncommon.
>
>I'm not sure I've seen one, and I've dealt with a *lot* of TIFF files
>over the years. 
>
>Other metadata such as the app that created the image etc. is quite
>common though, and I have a feeling that Photoshop puts in all sorts of
>extra tags (I haven't got a copy here with which to check)
>
>Whether any such tags are useful to preserve is another matter.
>Personally I like the accountability; I'd like to know who scanned a
>document, when they scanned it, what software they used to do the scan.
>Mainly because it may help at some future OCR stage in identifying ways
>of improving the process or runs of documents that are likely to cause
>trouble during the OCR phase. Plus of course it's nice to know who was
>responsible for the hard work!
>
>cheers
>
>Jules

Hi
 The biggest problem I think TIFF has is that it is really just
a container and not truly a image format. From what I know,
one can put just about any data stream into a TIFF. It
need not be an image.
 When I said that I thought that a TIFF format was better for
archiving I intended it to mean an non-compress scanned image
thet is in a form that has little encoding.
 The TIFF allows all kinds of other things. I'm not saying
they should be used.
 I astro imaging, one often uses TIFF's to contain several
different color images to be processed later.
Dwight