On the pre-press output image color space conversion settings – pre-press, image processing, color – Printing Industry
For the printing of the output image files must be CMYK color mode, but can not be RGB mode. RGB mode to CMYK mode from the process, that is what we call the color separation process. Although this operation is very simple, but really to make color separation line with the actual conditions of the printing, color separation parameters must be set well in advance of work. Color separation parameter setting process is essentially part of color management, Photoshop color separation in the 5.0 version after setting parameters put together to color management into.
Start Photoshop software, open the Edit -> Color Settings command in the work space to the CMYK working space setting set, you can choose the built-in CMYK Photoshop color space, you can also print out the actual conditions of the user settings.
Gray space for It by the color model is converted to gray scale (GrayScale) values are greatly affected. For example, the same RGB color blocks R75G128B56, select DotGain 20%, the value is converted to GrayScale mode K 65%; choose DotGain 25%, the conversion to GrayScale mode K values of 60%; select DotGain to 30% , converted to GrayScale mode K values of 54%.
Spot color space settings It directly affects the display of the color spot color images. If DotGain 20%, the percentage of a network of special color display 55% brighter, to 30% when the DotGain constant, dark color on the display of some.
Color Management Photoshop in order to more effectively manage systems and applications through the color, can the ICC color profiling embedded in the image file. Embedded after, ICCProfile can describe the correct image file color space, to ensure color consistency. When the other applications to open the image files embedded ICCProfile, if the relevant settings and built-in inconsistencies, will automatically make judgments and decisions of what to do. In previous versions of Photoshop, from the "Profile Settings" to document the work of the embedded ICCProfile, Photoshop7.0 have been changed, change the image file in the store when ICCProfile embedded work. If RGB images, RGB space embedded in accordance with the above settings embedded, so CMYK images, in accordance with the CMYK settings embedded space.
In other applications to open image files, if the face image embedded ICCProfile does not match the software settings, or when the image is not embedded ICCProfile, how to deal with? This is ColorManagementPolices (color management policy) to be solved. In the Edit -> Color Settings dialog box contains the color management program (colormanagementpolicies) content, the setting shown in Figure 6, respectively here on RGB, CMYK, Gray image set, but the basic content is the same.
Photoshop color space conversion method set
Open the Edit -> Color Settings dialog box, select the dialog box at the top of the "Advanced Mode (AdvancedMode)", the "conversion options (ConversionOption)" Department, can be the choice of color space conversion. To select the color management engine (Engine) and for color space conversion color conversion method (Intent).
Photoshop color management in the basic settings
Open the Edit -> Color Settings dialog box, the top of the dialog box has a "Settings" drop-down menu, it is mainly decided on what kind of color management settings. Specific settings include "color management shut down", "Photoshop5 default color space", "Web Graphics default setting", "U.S. prepress default setting," "European prepress default setting," so the operator can be used as appropriate. If these settings are modified, the custom settings.
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