Posts Tagged ‘print color management. quality printing’

Converting raster images from an RGB colorspace into a print CMYK colorspace has two significant impacts:

1) Typically a compression and alteration of colors as the image is transformed from the original RGB gamut to the different gamut used for CMYK presswork.

2) The on-press printability of the imagery in terms of color stability, press performance/runnability, and ink usage (i.e. cost).

Converting images from one CMYK separation condition into a different CMYK separation condition by reseparating files is primarily intended to enhance the printability of the imagery while maintaining the appearance of the original CMYK
imagery. Put another way, reseparating CMYK files is effectively a way to optimize press forms.

Under Color Removal & Grey component Replacement (UCR & GCR)

The principle of RGB to CMYK separation:
In order to go to press, RGB color images must be converted to their process color counterparts; cyan, magenta, and yellow. An achromatic black channel is added because if the color black in presswork is just made from CMY it can often appear “muddy” or “patchy.” Also, making dark colors from the three chromatic process colors can lead to a higher than desirable volume of ink on the press sheet.

Neutral colors made up of three process colors are also more difficult to maintain consistent on press as solid ink densities normally vary through the run compared with a neutral made primarily of a single black ink. The net effect of introducing black ink in process printing is a reduction of ink usage/costs, stabilization of color (especially gray
tones), and and better printability.
The conversion process is done by taking the 3 channel RGB image, passing it through a 3 channel device independent CIEL*a*b* profile connection color space where the RGB is converted to CMY and the black channel added, and finally
outputting the result as a 4 channel CMYK image.

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PDF Settings Download

Usually we never know what is the right settings for creating a PDF.  Please find below some of the best recommended settings.  Please download and give your feedback.

Download and Install PDF Presets
For use with Adobe Indesign & Illustrator

Download For Mac OS X (10.4 and later)

Download For Windows 2000 / XP / Vista / 7

Note: You only need to import into either INDESIGN or ILLUSTRATOR, it will share the same PDF PRESET.

1. IMPORT PDF PRESET INTO ADOBE INDESIGN

From INDESIGN at the top of the window go to > FILE > ADOBE PDF PRESETS > DEFINE > LOAD > Navigate to the PDF Preset file that you downloaded > HIGHLIGHT PDF PRESET FILE > OPEN > DONE. PDF Preset is now loaded into Adobe Indesign.

TO CREATE PDF FILE FROM INDESIGN

From INDESIGN at the top of the window go to > FILE > ADOBE PRESETS > DUKE PDF > CHOOSE LOCATION TO SAVE PDF TO > SAVE > EXPORT

NOTE: File name should not be any longer than 31 characters including the .pdf extension.

2. IMPORT PDF PRESET INTO ADOBE ILLUSTRATOR

From ILLUSTRATOR at the top of the window go to > EDIT > PDF PRESETS > IMPORT > Navigate to the PDF Preset file that you downloaded > HIGHLIGHT PDF PRESET FILE > OPEN. PDF Preset is now loaded into Adobe Illustrator.

TO CREATE PDF FILE FROM ILLUSTRATOR

From ILLUSTRATOR at the top of the window go to > FILE > SAVE AS > CHOOSE LOCATION TO SAVE FILE TO > GIVE FILE NAME > SAVE AS TYPE > ADOBE PDF > SAVE > SELECT ADOBE PDF PRESET > DUKE PDF > SAVE PDF.

NOTE: File name should not be any longer than 31 characters including the .pdf extension.

4. If you have Adobe Acrobat Distiller and you would like to import the PDF Preset. From ADOBE ACROBAT DISTILLER at the top of the window go to > SETTINGS > ADD ADOBE PDF SETTINGS > Navigate to the PDF Preset file that you downloaded. >HIGHLIGHT PDF PRESET FILE > OPEN. PDF Preset is now loaded into Adobe Acrobat Distiller.

The factors which influence halftone dots