Changing file from CMYK to Black and White - Adobe illustrator

This is a discussion on Changing file from CMYK to Black and White - Adobe illustrator ; Is there a quick way to change a file that has opacity masks in it to change from 4 color to a simple black and white file with black tints. I have gone through the file and checked out every ...

+ Reply to Thread
Results 1 to 9 of 9

Changing file from CMYK to Black and White

  1. Default Changing file from CMYK to Black and White

    Is there a quick way to change a file that has opacity masks in it to change from 4 color to a simple black and white file with black tints. I have gone through the file and checked out every path and stroke in it and I cannot find where the CMYK is.

  2. Default Re: Changing file from CMYK to Black and White

    I think you just go Filter/Colors/Convert to Grayscale. You then have to make the screen values rounded numbers, because the grays will not come up as being, for example, 20% .... it will be something like 18%

    Still learning my way around AI, so if anyone knows of another way ...

    Hope this helps!

  3. Default Re: Changing file from CMYK to Black and White

    This method will work, but it still makes a C,M,Y,K color plate. I need to have only one color plate, Black.
    Gregg

  4. Default Re: Changing file from CMYK to Black and White

    I'm pretty sure that if you remove all unused colors from the swatch palette except black, and then make sure the black is 100% black, only the black plate will print ....

  5. Default Re: Changing file from CMYK to Black and White

    Gregg,

    How are you determining that you get C/M/Y plates?

    If you are just using the Document Info palette, it is not a reliable indicator, since it will include objects that contain only K but have the color type being CMYK. The text engine when converting 0/0/0/100 CMYK text to grayscale leaves it 0/0/0/100 CMYK instead of giving it a grayscale color type, but it will generate only a black plate.

    Have you tried opening the file in Acrobat and previewing separations?

    Is the CMYK perhaps inside the Opacity Masks? I'm pretty sure Convert to Grayscale doesn't go inside opacity masks. (It also for sure won't go inside gradients, patterns or symbol definitions, but if that was the problem it would be pretty obvious, so the colors must be somewhere less visible.)

    Ginni,

    Why is it better to change the grayscale values to multiples of 10%? Wouldn't you lose subtle differences that way, so that more objects became indistinguishable? (Always a risk in converting from color to grayscale even without rounding.)

    It would not be hard to add a "Round to Multiples of" field to the Convert to Grayscale filter; I just imagine nobody anticipated that it would be wanted.

  6. Default Re: Changing file from CMYK to Black and White

    Teri,

    I'm still learning my way around AI, so I can't answer your question .... I assumed that on the printer's end of things - the even number screen print more accurately?

    Another thing I can't figure out to do is to print seperations from AI, to check for this sort of thing, like I was able to do in FreeHand - can't that be done without coverting to a PDF?

  7. Default Re: Changing file from CMYK to Black and White



    I assumed that on the printer's end of things - the even number screen
    print more accurately?




    No, it doesn't make a bit of difference.

    Another thing I can't figure out to do is to print seperations from AI,
    to check for this sort of thing




    You cannot preview separations inside Illustrator. The Acrobat route is by far the easiest way to preview separations. Assuming you are saving with PDF compatibility, which is the default, Acrobat can open native .ai files, so you don't have to explicitly save as PDF. You can just open any old default-saved .ai file, go to the Advanced>Preview Output command, and uncheck any plates that you don't want to be previewed.

    You can print separations from within Illustrator by going to the Output pane of the Print dialog, and changing the Output mode from Composite to either Separations (Host-based) or In RIP Separations, depending on whether or not you are printing to a RIP that can do separations. But I would think the Acrobat method would be preferable, since it is a lot faster and you waste no paper.

  8. Default Re: Changing file from CMYK to Black and White

    ahh - thanks for that .... that option in the output mode was grayed out until I selected Adobe Postscript File in the printer drop-down menu

    so little time, so much to learn

  9. Default Re: Changing file from CMYK to Black and White



    >This method will work, but it still makes a C,M,Y,K color plate. I need

    to have only one color plate, Black.




    If you are saving to a pdf, pdfs ALWAYS contain the cmyk channels regardless if there is any image contained within the channels.

+ Reply to Thread

Similar Threads

  1. Changing a video black and white
    By Application Development in forum Adobe Premiere
    Replies: 2
    Last Post: 07-18-2007, 06:52 AM
  2. Re: Scanned images have reversed black/white(white text on black background)
    By Application Development in forum Adobe Acrobat
    Replies: 0
    Last Post: 02-09-2007, 05:57 PM
  3. Re: Scanned images have reversed black/white(white text on black background)
    By Application Development in forum Adobe Acrobat
    Replies: 0
    Last Post: 02-09-2007, 05:51 PM
  4. Re: Scanned images have reversed black/white(white text on black background)
    By Application Development in forum Adobe Acrobat
    Replies: 0
    Last Post: 02-09-2007, 05:45 PM
  5. Scanned images have reversed black/white(white text on black background)
    By Application Development in forum Adobe Acrobat
    Replies: 0
    Last Post: 02-09-2007, 05:40 PM