3 Replies Latest reply on Sep 30, 2013 5:25 AM by Chuck Uebele

    Image Conversions

      1. Have an original 4-colour CMYK Image
      2. I want to turn it into K only grey
      3. I want to turn it into a 3-colour CMY only grey
      4. I want to turn it into a 4-colour CMYK grey only
      5. I want to compile one composite image with top half being the K only
      6. Bottom Left to be 3-colour CMY grey only
      7. Bottom Right to be CMYK grey only



      This exercose is to show one image output in the above scenarios but showing grey balance output.


      Thank you.

        • 1. Re: Image Conversions
          Chuck Uebele Adobe Community Professional & MVP

          On each image do the following:


          Flatten the image if it isn't flattened all ready.

          Duplicate the background layer twice cmd/ctrl-J

          Rename one layer K

          Rename the other duplicate layer CYM

          Select the CYM layer and go to the channels and select the black channel and fill it with white

          Select the K layer and then go to the channels panel and fill the Cyan, Magenta, and Yellow channels with white.

          Change the image mode to grayscale.

          Add layer masks to the layers so that you get each layer in the position you want.


          cymk test.jpg

          • 2. Re: Image Conversions
            Gordon6 Level 1

            Hi csuebele,

            Thank you for your assistance. I have followed your steps but get lost when you ask to convert the image to grayscale.

            I want to end up with one CMYK Image, that has K only on top, CMY bottom left and K only bottom right.

            All in grey to check for grey balance.

            I follow your steps, but when I convert to greyscale, of course that's what I end up with, but I would like to maintain a CMYK file, but when checking in say photoshop, top is K, bottom left is CMY and bottom right is K.


            Can you help with the last little step. Thank you.

            • 3. Re: Image Conversions
              Chuck Uebele Adobe Community Professional & MVP

              To change it to grayscale, you can go to the top menu and select Image>mode>Grayscale.  You can change it back to CYMK afterwards using the same menu.  The reason I did this is that at first, I tried just desaturatiing the layers to remove the color, but for some reason there was a red cast remaining.