[Scribus] grayscale images imported as RGB?

[Terence Chan]

Excuse my ignorance but why is it important/deirable to have greyscale
images on the K plate only? I finished a book recently with lots
of greyscale images colour profiled in RGB/CMYK PDF (set to "printer").
The page proofs from the printer look just like what I wanted, so what's
wrong with that?

Terence

On Tue, 13 Mar 2007, Vladimir Savic wrote:

>
> Try! And prove you're wrong! Tested with Acrobar Pro from CS creative suite.
> RGB input is not a bad solution at the first place. :) Output is color
> profiled CMYK PDF. (which means that fallowing my procedure, finally applied
> color profile will only effect visual appearance of K plate, but not it's
> nature - it will be grayscale (that is K only), not composite grayscale.)
>
> BTW, I'm running linux, so I don't have anything other then The GIMP to work
> with. Using PS on win boxes is much faster/natural way to make CMYK images
> without that much pain, but never tried it... :(
>
> Vlada
>
> > Setting the image to CMYK does work for me. I don't know wich app you
> > use but if you convert
> > your image to CMYK you should make sure you delete all data from the
> > CMY channels and copy the original
> > K or Grayscale data only to K or try "maximum Black" conversion mode
> > (before you import them)
> >
> > Jon
> >
> > Am 12.03.2007 um 12:54 schrieb Vladimir Savic:
> > > On Monday 12 March 2007 17:43:36 Terence Chan wrote:
> > >> Yes, I believe this is normal behaviour for scribus - why is this
> > >> a problem? So long as you apply the appropriate icc input and output
> > >> profiles the greyscale images should appear ok when printed and on
> > >> the screen.
> > >>
> > >> Terence
> > >
> > > Hmmm...
> > > I was doing something obviously wrong here too (talking about
> > > Scribus 1.3.3.x
> > > not 1.3.4cvs). "Appropriate profile" is a key point. No profile can
> > > ensure
> > > grayscale RGB (picture in RGB color space but completely
> > > constructed of r=g=b
> > > values pixels) picture to appear on K plate only when PDF gets
> > > token to
> > > prepress office.
> > > Right approach would be to ask of user if imported picture is
> > > composite
> > > grayscale picture or single color channel image. Fortunately, in
> > > 1.3.4 there
> > > is a simple solution: image effects -> apply colorize image and
> > > give that
> > > picture 'black' color colorization (Don't take further writing for
> > > granted
> > > but I think choosing 0%C 0%M 0%Y 100%K "in-Screibus hand made"
> > > color doesn't
> > > work correctly)
> > >
> > > Vlada
> > >
> > >> On Sun, 11 Mar 2007, Lila Pagola wrote:
> > >>> hi!
> > >>> I'm working with Scribus in a book, almost finished, because we
> > >>> are in
> > >>> press with everything except cover.
> > >>>
> > >>> Preparing the cover design for pre-press (I don't if in english
> > >>> it's said
> > >>> that way), I have found a rare behavoir of Scribus with grayscale
> > >>> images:
> > >>> they are considered as RGB files, in any format I try to import them
> > >>> (PNG8, gif, tif). And If I import them as CMYK I have information
> > >>> in the
> > >>> 4 channels when the image is just black.
> > >>>
> > >>> Somebody has experiencied something similar? Am I doing something
> > >>> wrong?
> > >>> I did a quick search on the web and the list's archives and I
> > >>> didn't find
> > >>> any report of this problem.
> > >>>
> > >>> Our project has a wiki when we are uploading the problems and
> > >>> solutions
> > >>> we found, in spanish, sorry (and for my english sorry too)
> > >>> the url is http://nomade.liminar.com.ar/wakka.php?wakka=MaBI
> > >>>
> > >>> Thanks in advance for any clue ...
>
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