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Thread: [HELP] Changing image colours in a PDF

  1. #1
    Junior Member blootac will become famous soon enough
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    [HELP] Changing image colours in a PDF

    A client has supplied a PDF made from a Word document for a very short run digital colour print run. I know, it's akin to asking for trouble ...

    We converted the RGB images to CMYK and they look good in the PDF, but they are coming out way too dark when printed.

    Is there some way to lighten them in the PDF so that they'll print lighter?

  2. #2
    Banned philmusiker is on a distinguished road
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    You need the 'Action List' function of Enfocus PitStop v10 to convert RGB images to CMYK inside Acrobat. Before this, you need to setup the color management for your Pitstop.

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    Junior Member blootac will become famous soon enough
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    Thanks for the suggestion. I still use Acrobat 9, but have the same options in Pitstop as far as I can tell.

    However, is this going to make a difference even though the PDF we've generated already looks perfectly fine on screen?

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    PRC Member r00tp will become famous soon enough
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    Quote Originally Posted by blootac View Post
    A client has supplied a PDF made from a Word document for a very short run digital colour print run. I know, it's akin to asking for trouble ...

    We converted the RGB images to CMYK and they look good in the PDF, but they are coming out way too dark when printed.

    Is there some way to lighten them in the PDF so that they'll print lighter?
    callas pdf toolbox has nice color conversion presets for office documents. you can also lighten the whole pdf with some presets or even define your own correction curves. Last option is a bit tricky though.

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  6. #5
    shampa
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    Do you have a good reason not to just send it to print as an RGB job and let the rip sort it out?

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    Junior Member blootac will become famous soon enough
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    I have to mention that I'm no pre-press wizard and the thought of having to create my own presets or curves scares the bejeezus out of me.

    I was hoping to find a quick and easy plug or trick, but it sounds as if I'd be better off asking the print shop to muck around with the file.

    Or - and this would be the best solution of all from my point of view - convince the client that we should produce whole new art in InDesign!

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  10. #7
    Junior Member blootac will become famous soon enough
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    Quote Originally Posted by shampa View Post
    Do you have a good reason not to just send it to print as an RGB job and let the rip sort it out?
    A thought ... I'll have a chat with the printers in the am.

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  12. #8
    shampa
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    Quote Originally Posted by blootac View Post
    I have to mention that I'm no pre-press wizard and the thought of having to create my own presets or curves scares the bejeezus out of me.
    You shouldn't have to. If it is looking good on-screen after the conversion then either:
    a) a different profile is being used to print the job, compared to what you converted to
    b) the printers calibration is out
    c) your monitor is showing the wrong colours and the file was bad all along

    Messing with curves is good when you are on a deadline and need a quick fix, but they can quickly dig you into a hole and make a mess down the track. You are better off figuring out the real cause.

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  14. #9
    Junior Member blootac will become famous soon enough
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    And indeed, after speaking to the production manager, it was agreed that the problem is not with the PDF but rather with the equipment. They're now recalibrating the equipment to fix the problem. Phew!

    Thanks for your help and suggestions, everyone.

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  16. #10
    Junior Member Deaken is on a distinguished road
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    rip

    I learned that using the rip to convert the colors is better than converting them in acrobat.

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  19. #11
    Junior Member p.eulampy is on a distinguished road
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    You can use Acrobat Advanced Editing tool called 'Touch Up Object' - right click on RGB bitmap, select 'Edit image', correct it in Photoshop (apply working profile) and save - Acrobat will update it in pdf.

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  21. #12
    Junior Member blootac will become famous soon enough
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    Thumbs up

    Oh really? I've got to try that!

    But it is too late for this project as the printers have recalibrated their equipment after not quite agreeing that the problem was at their end.

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  23. #13
    Junior Member LarryX is on a distinguished road
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    Quote Originally Posted by blootac View Post
    but they are coming out way too dark when printed.
    One off the possible problems also Big resolutions bitmap (raster) objects/
    if they are less more 2x bigger than Rip Lpi...
    (for example: 175 lpi requires no more than 350 dpi per bitmap object's)
    or if you print on office printer - resolutions required no more than 600 dpi...

    ---when bitmap send to rip or printer in big resolutions, this get a darked...

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  25. #14
    Junior Member blootac will become famous soon enough
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    Thanks for the thoughts, Larryx.

    Neither was the case here. The image res was no more than 300dpi and the printer is some $1,000,000+ colour monster rather than a $500 office printer.

    The real problem ended up being the settings at the printer's end. Now all fixed, as I mentioned.

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    Donor momo.cassiopeia is on a distinguished road momo.cassiopeia's Avatar
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    color management in rip vs object based in acrobat

    i know its all solved now, but i would strongly advice you against using the rip to color manage files at the last minute. might be just me but i like to see what i get before i submit it to the rip. and even acrobat offers nowadays very good tools in the prepress palette.

    all left for you to do is get a few suitable icc profiles and verify your results.

    and let the rip do what i can do best - rip!

    object based workflows, and thats what pdf workflows are, should have all those steps way before the rip, allowing you more options in file preparation as well as easing the workload at final output time.

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