[Scribus] grayscale images imported as RGB?
Mon Mar 12 23:47:18 CET 2007
El lun, 12-03-2007 a las 23:00 +0100, jon escribi?:
> >> Lila Pagola
> I think scribus should (as most layout applications I know) use the
> provided colorspace of the
> imported images or eps (think this is what you intended) and don't
> apply colorspaces different
> from that. Colorspace conversion might be fine - but this IMO should
> be handled as a seprate feature.
> Isn't it possible to set grayscale images to DeviceGray - RGB to
> DeviceRGB - CMYK to DeviceCMYK if
> there is no profile provided, otherwise read out the appended profile
> and simply use it?
> IMO image data shall never be processed nor converted anyway if not
> intended or needed.
> That might not help you in your case, but if you know how would you
> like to add your wishes (if)
> to the scribus wish list? (I don't know how to do this by myself)
I think I will try. Maybe is a way to working, but with no real accurate
color control as it's normal here, and a case of a two colors print with
photograhs, I don't see more solution than a grayscale image working
with just one black channel.
> For now according to what Vlada says tinting the image with the
> grayscale "effect" might lead to some
> solution. But I don't think it will, because scribus' choice of
> profile stays the same: RGB-input.
> 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)
yes, I thought in this option. I'm using Krita to convert to cmyk, but
till a minute before I didn't realize that I can separate the channels
in layers and erase the color information there.
> 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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