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Hi Jean

Le 2011-06-26 18:11, Jean Hollis Weber a écrit :
Earlier, I wrote:
On Sun, 2011-06-26 at 08:45 -0400, Christopher Lee wrote:
Why not host two versions-- one colored one for presentation, and
another one in grayscale with "Print Optimized" in the link name or
description?  Many websites have separate options for printable
versions, and I think many users are used to selecting a different
print option if it's available.
That's an interesting idea. I convert the colour version of the full,
compiled books to grayscale before submitting them to Lulu, so there's
no extra work involved for them. However, the individual chapters would
be in colour only unless someone took the time to convert them.

Technical aside:
I use Acrobat Pro to do the conversion from colour to grayscale, save
the result as PostScript, and then create a new PDF using Acrobat
Distiller. This has the added advantage of dramatically reducing the
file size. Even without the "convert to grayscale" step, the other 2
steps are necessary to ensure that Lulu's printers accept the file.
Although some PDFs produced directly from OOo/LibO print on some of
Lulu's printers, not all are accepted. Lulu's techs told me to use the
"save as PS&  redistill" technique to avoid any problems.

More info:
The technique I described converts *everything* to grayscale: headings,
LibO logo, background colours on tips/notes/cautions, as well as images.
To convert only the images would require a macro to select each one and
change it (manually would take far too long), but that has an unwanted
side-effect: the little caution symbols would be grayscaled against a
coloured background. I suppose one could run the macro to stop at each
image for an operator decision, but that's not very efficient. Or one
could eliminate the caution symbols and keep only the word. Or...

My point is that all these choices have side-effects which should be
taken into account but are often overlooked.


Yes, this is definitely a point that must be considered. We still need to try to keep this as manageable as possible, but if we need 2 versions to simplify the process, then we can do a grayscale at the same time as the coloured version.

Is the conversion a requirement that was established by ourselves or Lulu's? Is this standard practise and a "must" when sending files to print in greyscale?

I wonder if there is also a way to complete the conversion with another tool other than Acrobat Pro. We also need to keep this as accessible to other contributing members. Acrobat Pro retails for approximately US$450 which puts it out of reach for many. We should really look for FOSS alternatives. Let us know if we can help with this.



Marc Paré

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