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 http://www.bojer.no/Ariadne2006/ariadnes_aarbok2006-omslag-TilTrykking-BareEttBilde.pdf and see if it show up grayish? And then what about http://www.bojer.no/Ariadne2006/ariadnes_aarbok2006-omslag-TilTrykking.pdf 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: http://www.bojer.no/Ariadne2006/ariadnes_aarbok2006-omslag-somBildeGB.tiff >> 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
