The version 1.6 brings an enhancement of the color conversion/color profile management.

Now the entire document is converted to specified color space and profile.

The relevant parameters are the same available in Adobe Acrobat

We are using the Adobe PDF Library for the conversion, specifically the Adobe Color Management Module (CMM in this document):

In the Output Tab of the Print dialog box you’ll find the Color section:

The available options are:

Color Conversion

•No color conversion: there is no conversion action, all conversion parameter are ignored (disabled on print dialog box).

•Convert to CMYK: convert to CMYK.

•Convert to RGB: convert to RGB.

•Convert to Grayscale: convert to gray scale.

Color Profile Destination

The list is not available if "No color conversion" is selected on the Color conversion box.

Otherwise, the list shows all the available color profiles for the selected conversion, installed on the IIS server computer, you are connecting to (got from edo.ashx call).

Important: it is your responsability to install the same color profiles on all the GN4 servers including the Back4 one(s).

For CMYK conversion, the default selected profile will be the color profile associated to the current typography.

The list of color profiles got from the call to edo.ashx is cached on the client computer. So, if color profiles change on the server, you need to restart the GN4 application.

Rendering intent

The rendering intent determines how the Adobe CMM maps colors. The four rendering intents are:

•perceptual

•saturation

•relative colorimetric

•absolute colorimetric

Find the best intent testing the output, or ask your print department for the best choice.

Include Profiles

If selected, embed the target profile in the output.

Preserve Black

If selected, perform a black-preserving transformation when converting.

Conversion schema (when you enable conversion)

Original objects (images and PDFs of any color space - rgb, gray, cmyk) are first converted to the CMYK Color Profile defined on the Colors Profile box of the Edit Colors dialog box in the current typography.

After this preliminary conversion, the defined color conversion is applied.

Separation and Color Conversion

Note that if your print configuration enables Separation (on the Advanced tab), this will cause the conversion settings to be ignored.

XML representation of the printOptions object

These are the relevant entries in the xml of the printOptions object, as generated by the settings in the dialog:

<printConfig ...>

<access>...</access>

<description/>

<params>

<PrintDictOpt>

  ...

<KeyValue key="DefColorProfile" value="Euroscale Coated v2"/>

<KeyValue key="ConvertColors" value="ConvertToGRAY"/>

<KeyValue key="DestinationProfileName" value="Dot Gain 30%"/>

<KeyValue key="PreserveBlack" value="true"/>

<KeyValue key="IncludeProfiles" value="true"/>

<KeyValue key="RenderIntent" value="Perceptual"/>

</PrintDictOpt>

</params>

...

</printConfig>

DefColorProfile is automatically set using the current typography profile (so it’s not set by the dialog).

DefColorProfile and DestinationProfileName parameters contain the colorprofile desc attribute, an internal property of the colorprofile. If DefColorProfile has value "Euroscale Coated v2", probably there is no correspondence with a hypothetical file Euroscale Coated v2.icc; the definition of Euroscale Coated v2 is internal and file-name independent.

In the print options there are other parameters about color conversion and color profile (joboptions source) but are not used.

Backwards compatibility

The new color profile convert processing is backwards compatible with the old print configurations.