[Scribus] cmyk workflow

Axel Bojer axelb
Mon Feb 5 19:14:13 CET 2007

jon skrev:
> Am 05.02.2007 um 16:26 schrieb Axel Bojer:
>> Thus my workflow has been:
>> 1. Import unedited image
>> 2. Scale the image + its frame until it fits as I wish
>> 3. Use Gimp to rescale my image to the size I found in 2)
>> 4. Import the changed image
>> (3 and 4 are meant to save space, I don't think you *have* to do this)
>>   And when I am totally finished
>> 5) Export the whole document as pdf -- then the image should be
>> converted to CMYK by Scribus, or so I thought it was at least ...
>> But I have a problem concerning this:
>> Right now I got a telephone from my printer saying my pdf resulting  
>> from
>> these steps are not usable, but greyish instead of grasgreen.
>> See the results yourselves here:
>> http://www.bojer.no/Ariadne2006/ariadnes_aarbok2006-omslag- 
>> ForSkjerm.pdf
>> http://www.bojer.no/Ariadne2006/ariadnes_aarbok2006-omslag- 
>> TilTrykking.pdf
>> ("skjerm" means screen, and is the rgb variant, "Trykk" means print and
>> is the one intended to be printed).
>> When I look at it in XPD or Kpdf it really looks greyish, as he said  
>> (he used Windows I suppose, at least he said he was using Acrobat), but on
>> acrobat on Linux it show as it should, no greyish tone to it as in  
>> xpdf.
>>   Having repeadedly read in thes thread, that acrobat is to be trusted
>> over all the other pdf-programs, I trusted it to be OK, but it seems
>> not. Or is he mistaken??
>> Now, what I have as a pdf-file is made out of many imageframes linking
>> to the same picture. This gives a nice effect, and keeps the file  
>> pretty
>> small. But the printer was in doubt wether his equipment would be able
>> to use it, I am not sure, but said I think it ought to be ok (after all
>> this function is quite the same as in other DTP programs, so I excpect
>> this to be no different). But he wanted me to ?flatten the image?, that
>> is merge all my layers into one.
> Flatten  here should mean reduce transparencies to real.
> As your file looks - you are using transparancies wich are not  
> printable as long as
> your printer doesn't use sufficient equipment or ripping procedures.
> Unauthorized rendering of transparencies sometimes leads to unwanted  
> results.

Yes, i sorted that thing out :-)
The strange thing though is, is that also when all the file is just one 
single rgb tiff file I get the same issue (grayish in kpdf and xpdf, but 
not in acroread). Could someone on wondows (or mac perhaps) please take 
a look at
and see if it show up grayish? And then what about
The latter is the one with all the layers and the transparency.
By me they show up just the same. So how am I supposed to know if the 
printer can use them or not? (OK, I know, I should be carefull with 
transparency, but apart from that, I mean ...)

For reference, here is the image file:

>> So the only reasonable way I found
>> (without having to redo everything) was to export as png, put this png
>> file as the only element in a new file with the same dimensions and  
>> then export to pdf again.
>> I looked at the png-file in Gimp, and it looks ok and is RGB.
>> The resulting file though is really greyish. Now I am not quite sure  
>> how
>> to solve this, I had trusted Scribus to just solve this for me by  
>> export time ...
> You might trust scribus only if you know what you are doing. RGB to  
> CMYK conversion is not a simple thing.
> The color space of RGB is much wider than CMYK. Colors displayable in  
> RGB are not always convertable to CMYK.
> e.g. rgb (0,100,0) is by no way reproducable in cmyk it might be  
> clipped to, say, cmyk (50-0-100-0).
> Everything here depends on colormanagment modules, rendering intents  
> and profile settings.
I  will take a look at your suggestions, especially if someone can tell 
me if the last file is not ok :-/

> Another way around is to change the colors in your png (in Gimp) to  
> something which in your opinion
> might be printable. And reimport these files.

Yes, but grasgreen is almost the only colour (along with some tones of 
yellow), is that a colour especially tricky to convert from rgb to cmyk?

Best regards
Axel Bojer

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