[Scribus] Color problem w/ 1.3.4

[Christoph Schäfer]

Am Freitag, 12. Oktober 2007 19:55:43 schrieb Matt Gushee:
> Hi all,
>
> I am working on a document in Scribus 1.3.4, and am having trouble
> getting one color to come out right.
>
> I have a background image that is almost entirely black and white (with
> just a little grey due to antialiasing)--it's an abstract pattern based
> on a photo of tree branches. Anyway, I have overlaid the image with two
> colored rectangles--one is blue, the other is yellow (specifically, it
> is Gold1 from the standard Scribus palette--CMYK=0, 0.16, 1, 0). Both
> rectangles have their fill opacity set to 100%, but I am using different
> blend modes--Darken for the blue rectangle, and Lighten for the yellow
> one. The result I am trying to achieve is black "branches" on a blue
> background, and yellow branches on white in the other.
>
> Everything looks as it should in the normal Scribus view and in the
> print preview, but when I export to PDF (PDF 1.5, Output intended for
> printer), the yellow changes to something more like beige (it looks this
> way when I display the page in Acrobat Reader, and when I print). The
> changed color is bad enough by itself, but I also have some text in the
> same shade of yellow, which prints out correctly--i.e. the text and the
> graphic are supposed to be the same color, but they are different.
>
> Now, I'm thinking the problem may be due to the background image being
> in RGB colorspace--indeed, I converted the image to CMYK, and I then get
> the desired colors when I view the PDF in Acroread--so I am guessing the
> printed result will also be good. However, that converted image isn't
> usable for the final product. I used the ImageMagick 'convert' program,
> and the results are rather bizarre: the image is indeed CMYK, but it
> also gets stretched and cropped in an arbitrary fashion, and black and
> white are inverted. So I'm not sure how to get a usable CMYK bitmap
> image. For image editing I mainly use GIMP 2.2, which doesn't really
> handle CMYK.
>
> Anyone have a suggestion?

If you are on *nix, you can try Krita which does colour conversion quite 
reliably.

HTH

Christoph