PdfTransparencyGroupAttributesKeysCS FieldTerminal Works - PDF Printing.Net Library
(Sometimes required, as discussed below) The group color space, which is used for the following purposes: • As the color space into which colors are converted when painted into the group • As the blending color space in which objects are composited within the group • As the color space of the group as a whole when it in turn is painted as an object onto its backdrop The group color space may be any device or CIE-based color space that treats its components as independent additive or subtractive values in the range 0.0 to 1.0, subject to the restrictions described in Section 7.2.3, “Blending Color Space.” These restrictions exclude Lab and lightness-chromaticity ICCBased color spaces, as well as the special color spaces Pattern, Indexed, Separation, and DeviceN. Device color spaces are subject to remapping according to the DefaultGray, DefaultRGB, and DefaultCMYK entries in the ColorSpace subdictionary of the current resource dictionary. Ordinarily, the CS entry is allowed only for isolated transparency groups (those for which I, below, is true), and even then it is optional. However, this entry is required in the group attributes dictionary for any transparency group XObject that has no parent group or page from which to inherit — in particular, one that is the value of the G entry in a soft-mask dictionary of subtype Luminosity. In addition, it is always permissible to specify CS in the group attributes dictionary associated with a page object, even if I is false or absent. In the normal case in which the page is imposed directly on the output medium, the page group is effectively isolated regardless of the I value, and the specified CS value is therefore honored. But if the page is in turn used as an element of some other page and if the group is non-isolated, CS is ignored and the color space is inherited from the actual backdrop with which the page is composited. Default value: the color space of the parent group or page into which this transparency group is painted. (The parent’s color space in turn can be either explicitly specified or inherited.)

Namespace: PdfEdit.Pdf.Advanced
Assembly: PdfPrintingNet (in PdfPrintingNet.dll) Version: (

public const string CS

Field Value

Type: String
See Also