Using ICC profiles for RGB to CMYK conversion

You can use ICC color profiles for conversion of raster images to CMYK color space. You can apply both color lookup tables and ICC color profiles on raster images.

In the configuration file, you can use the rendering intent methods listed below.

Method	Description	ICC name
Picture	The full gamut in the image is compressed or expanded to fill the printer gamut. The gray balance is preserved, but colorimetric accuracy may not be preserved. Most suitable for photographs and images.	Perceptual
Graphic	Preserves the saturation of colors in the image at the possible expense of hue and lightness. Most suitable for business graphics, such as charts, where it is important that the colors contrast well with each other.	Saturation
Proof	The colors are unchanged, except colors that fall outside the range that the output device can handle. These colors are adjusted to the closest color that can be rendered. The white point of the image is mapped to the white point of the printer.	Relative Colorimetric
Match	The same applies as for proof, except that the white point is preserved.	Absolute Colorimetric

To use an ICC profile

1	Specify the name of the ICC profile with the rgb2cmykprofile property.

2	Specify the rendering intent method with the renderingintent property.

Example 21

ICC color profile settings

In this example, raster images are converted to CMYK with the ICC color profile ijpds.icm and the rendering intent method picture.

<property name="rgb2cmykprofile">data/tables/ijpds.icm

  <property name="renderingintent">picture</property>

</property>