[scribus] hi and cmyk tiff export

[John Culleton]

On Wednesday 14 January 2009 05:58:48 pm minombresbond wrote:
> hi
>
> I'm graphic designer from argentina, and user of free software, my
> name is Juan Suárez
>
> many times I need design simple vectorial works (like a logo) when
> acurate control of cmyk values, for example, a figure with radial
> gradient from 100/60/0/0 to 100/60/0/40, I can draw it in Scribus
> and export to pdf to printing ok, or export to RGB bitmap or as rgb
> svg to work in inkscape etc,
>
> but how can I make a cmyk bitmap image from cmyk vectorial art
> from scribus? like a 'exporting to cmyk tiff' feature? if I export
> to RGB bitmap, and convert to cmyk space (with imagemagick or gimp
> separate pluggin, with icc profile), the result is that
> CMYK-to-RGB-to-CMYK ever change the original values, specially the
> cmyk colors with zero value in any C M or Y, and high K: in this
> case
>
> CMYK:100/60/0/40 to  RGB:10/40/97  to CMYK:100/76/29/16
>     V                                     V
>     V                                     V
> CMYK:100/60/0/0  to  RGB:33/66/148 to CMYK:99/60/4/0
>
> its really differents gradients and colors!
>
> the solution: implementing a *export to cmyk bitmap* feature! :)
>
> Scribus is the only mature vectorial software where a designer can
> draw any vectorial art whit colors and gradients in CMYK values
> (and thinking in the offset machine!), and if is there any problem
> with the pdf format in the filming provider, as far as I was, no
> other method to export the artwork! I think that is an important
> issue
>
> my actual solution: export to cmyk pdf and use ghostscript to
> generate a cmyk separation to tiff device:
>
> gs -dBATCH -dNOPAUSE -sDEVICE=tiffsep -dDOINTERPOLATE
> -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -sOutputFile=output.tif
> -r120 -MaxSeparations=8 example.pdf
>
> (seen on this page: http://wiki.contextgarden.net/Colors I have no
> idea about ghostcript!)
>
> this gs command generate output.tif and four c,M,Y,K grayscale
> outputs tifs, work fine with
>
> and I can re-import the cmyk tif to scribus artwork
>
> this excentric export to cmyk tiff is very usefull to my, thanks!
>
> saludos! sorry my bad english
>
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The tools in ImageMagick can be helpful here, specifically the convert  
command. 

-- 
John Culleton
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