Re: grayscale settings for offset printing
Re: grayscale settings for offset printing
- Subject: Re: grayscale settings for offset printing
- From: Jim Rich <email@hidden>
- Date: Wed, 14 Dec 2005 15:59:08 -0500
- Thread-topic: grayscale settings for offset printing
Title: Re: grayscale settings for offset printing
Here is something I wrote a while ago that should get you going down one of the few paths to create a grayscale profile.
If you wanted to use ICC profiles to profile a gray scale printer or a press you might want to consider using the Photoshop options for creating a grayscale profile.
Here are some steps for creating grayscale printer profiles:
Use the following steps to create grayscale ICC profiles in Photoshop.
1. Create a 13-step test target file of patches with halftone values of 2%,
4%, 6%, 8%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90%. This test
target can created in Photoshop or in a page layout program. Then print them
to your printer or if you are going to a press.
2. Measure the halftone dot values from the printed test file with a densitometer or a
spectrophotometer that uses software that can convert the CIE values to
halftone percent dot values.
Fine tuning as well as averaging of the printed dot values might be necessary especially for the highlight areas.
3. In Photoshop, go to the Color Settings menu and select Working
Spaces: Gray. Use the Gray pop-up menu and scroll to Custom Dot Gain.
4. Enter a name for your custom dot gain and key board in the 13 values into
the appropriate data entry boxes that relate to the percent dot values.
Enter OK.
5. To save the dot gain curve use the Grayscale pop-up menu Save Gray
option. Be sure to use the extension. ICC as you save the profile in the
ColorSync folder (Mac) or Color Directory (Windows).
Jim Rich
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