Monday, June 29, 2009

Confirming the Applied Calibration Plate Curve - without measuring the plate

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  1. This is great but I don't understand how to recombine 4 different bitmaps into a single cmyk image? Where can I get an explanation of this?
    Thanks

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  2. Sure you do.

    Open the first bitmap using PhotoShop. Let's say it's the Cyan bitmap.
    Do a "Select All" and "Copy"
    Create a new PShop document. You'll be asked what "Mode" you want the new document to be. Select "CMYK". That creates a new, empty/blank CMYK image the size of the bitmap you had previously copied.
    Choose "View Channel"
    Select the Cyan channel and "Paste" This places the Cyan bitmap file into the Cyan channel of your CMYK image.
    Open the Magenta bitmap. Do a "Select All" "Copy" and then paste into the Magenta channel of your CMYK image.
    Repeat with the Yellow and Black bitmaps.
    Now you have a CMYK bitmap image.

    Open the original CMYK continuous tone image that had been used to create the bitmaps.
    Go to "Image Size" And use the "increase resolution" option to increase the dpi of the original image to the same dpi as your bitmap CMYK image (likely 2400 or 2540 dpi). Use "Nearest Neighbor" as the method.
    You now have two CMYK images at the same resolution - one continuous tone, the other a screened bitmap. Both have the same resolution.

    Now with the continuous tone CMYK image, go to "Canvas Size" and double the height of the image by adding image area below the existing image. For example, If the image is 1" high it will now be 2" high - 1" of original image with a 1" blank area below it.

    Go to your bitmap CMYK image, do a "Select All" (make sure all channels are selected. Do a "Copy Image" then paste that into the original contone image. It will appear as a second layer in PShop. Position the bitmap layer so that the tone patches abut the appropriate tone patches of the original image. Then "Flatten" the image. Trim as required and Save As a new document.

    You're done.

    Impose this CMYK image in the gripper margin of your plate.

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