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
