Skip to main content
L
leighb61493055
Inspiring
April 22, 2021
質問

Need .png to be 100%k in pdf

  • April 22, 2021
  • 返信数 3.
  • 2036 ビュー

We have a product that is viewed online and printed in 2 color. Black is one. I can't seem to save a .png out as black only. I have gray scaled the image in Illustrator and I have changed the image to 100%k but importing the image into Word/Framemaker and then saving the image as a pdf still produces an image will all values of cmyk.

 

Saving the image as a .jpeg produces an image image that is only 100%k but the image online and in print appears gray and the file size for the book I am producing balloons up to an unmanageable size.

 

Surely there is some way to accomplish this. The printer is doing a lot of extra work and I have run out of ideas to solve this. Please help!

 

Thanks,

Leigh

このトピックへの返信は締め切られました。

返信数 3

Ton Frederiks
Community Expert
Ton FrederiksCommunity Expert
Community Expert
April 22, 2021

In Illustrator and InDesign it is perfectly possible to use grayscale PNGs (without transparency) and to export them as black or colorized with a spot color as PDF.

But you are using Word and or FrameMaker, the Illustrator forum may not be the right place to help you in that workflow.

Maybe someone in the FrameMaker forum can help you better.

  FrameMaker 

    L
    leighb61493055作成者
    Inspiring
    April 23, 2021

    Thank you for the suggestions. Grayscaling the image (Edit>Edit Colors>Convert to Grayscale) did not change anything but I'm not sure how to "export as black or colorized with a spot color". Can you elaborate on that process?

     

    The images are created in Illustrator so I assumed there was some way to save out the images (in Ilustrator) so these only black images truly are black when they get inserted in a file and a pdf is created to send to the printer. The printer is doing a lot of work to get these "black" images to be just black (just k--instead of cmyk). I was trying to save cost and time. 

     

    I don't think it is a Word or Framemaker issue. The text in the pdf that is NOT part of an image is 100% k only. I just feel like I am missing some step and there is an easy fix that I can do to eliminate this extra imagae work at the printer.

    Monika Gause
    Community Expert
    Monika GauseCommunity Expert
    Community Expert
    April 23, 2021

    Word is operating in RGB only. I don't know about Framemaker.

     

    So if the Word generated PDF has 100 K, that would mean that either Microsoft have implemented some sort of correction in their export or the print service has already done some conversion on that file.

      Ton Frederiks
      Community Expert
      Ton FrederiksCommunity Expert
      Community Expert
      April 22, 2021

      Illustrator does not save PNGs with profiles and applications like Photoshop guess sRGB.

      But it is possible to convert your PNGs to Grayscale Mode in Photoshop, that will be recognized as black only in InDesign.

      I always thought that PNG was an RGB only fileformat, but grayscale seems possible.

      Edit: According to the W3C PNG specification: Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits.

        L
        leighb61493055作成者
        Inspiring
        April 22, 2021

        My understanding is that a png is only RGB but when it gets saved in a document to pdf, it is cmyk. The images that I am dealing with are only black (there are other images that have spot color and I am letting the printer deal with those). I just tried to save the png in Grayscale Mode in Photoshop. Inserted the new .png into Word and saved as a pdf and I got the same thing. The image in Acrobat shows as cmyk instead of just black. Thoughts?

        Monika Gause
        Community Expert
        Monika GauseCommunity Expert
        Community Expert
        April 22, 2021
        quote

        My understanding is that a png is only RGB but when it gets saved in a document to pdf, it is cmyk.


        By @leighb61493055

         

        Not necessarily. This depends on the options.

         

        You'll have to contact the printer about this or you can also try and get a prepress expert who does the conversion for you if you don't have the necessary tools.

          Monika Gause
          Community Expert
          Monika GauseCommunity Expert
          Community Expert
          April 22, 2021

          PNG is an RGB-only file format. So what you want is impossible.

           

          Please tell us about how your file will be used and produced.

            L
            leighb61493055作成者
            Inspiring
            April 22, 2021

            Thanks for your quick reply.

             

            The .png images are imported into dita files. Those dita files are used to produce downloadable epubs as well as for use in an online product. Those same dita files are used to create a pdf that is sent to the printer. This particular product is 2 color--black and blue. The text of the files is displaying in the pdf as 100%k and some of the images should also be 100%k but the printer is needing to manipulate the black images so they are only k.

             

            What am I doing wrong?

            Monika Gause
            Community Expert
            Monika GauseCommunity Expert
            Community Expert
            April 22, 2021

            Since you need black and blue in the images, greyscale isn't an option.

            You will need to rely on the printer adjusting your files. It *is* possible to convert images with proper color management, but the question would be if this particular printer offers it.

             

            Other option: make a separate file for printing that uses a different image type which supports CMYK

              契約条件Accessibility statement
              Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices