Lars Eirik Rønning wrote:
> I have images which are generated to a pdf from batik.  When i open my 
> pdf in acrobat and click on all different image elements, the indicated 
> size of the element is far greater than the actual pixel data.

This can happen.
Out of curiosity: don't these images look blurry?

> The fact that the image elements seem to be larger than what is 
> available as visible pixel data could that have any side effects in 
> terms of pre press for instance?

Sometimes images look better on screen then when printed.
For instance: in Flanders we get these newspapers with
advertisements in our mail box every week, and sometimes
images that were added look horrible because people used
some low resolution images from the internet that 'looked
OK on screen' but isn't very nice when printed on paper.

> What i fear is that if element1 and element2 overlap eachother(that is 
> based on the shaded area in acrobat, not visible content) will this 
> effectively mean that the overlapping part of image1 is affected by for 
> instance color correction on image 2?

Oh, that's another question. The default is that the images
are opaque.

So if part of image 1 overlaps image 2, the colors of image 2
that are underneath won't affect the colors of image 1.
This is different as soon as you introduce transparency,
blending modes and the other (rather difficult) stuff I
describe in section 11.2.

If I were to rewrite that section, I'd probably trim it down,
because I've noticed that some people are confused. For instance:
I wrote about Overprint. That part is easy to misinterpret.
It doesn't apply to the printing of images. The problem is that
I originally explained this in a way that nobody understood.
I talked about comic books I bought as a child. These comic books
were printed in different colors that were 'added' to each other
(printed on top of each other with a combined color as result).
Sometimes a page had a small offset (by accident) and the same
shapes printed in different colors didn't overlap correctly (you
saw the different colors that were used in the border zone of
the shapes). First of all: I wasn't sure if this really qualified
as 'an overprint problem'; secondly, my editor wanted me to reduce
the number of 'personal anecdotes' ;-)

> I was hoping that Leonard could perhaps help?

He'll be able to provide the 'definitive' answer.
(PDF is huge and the press sector isn't my specialty.)
br,
Bruno

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