Transparency Blending Color Space

[Aaron Gravesdale]

Q:

When I open Output Preview in Acrobat, it lists the "Transparency Blending Color Space".  Where is this value coming from, and how can I discover it in a PDF document using the PDFNet SDK?

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A:

This value is populated from a colorspace specified in a page's optional Group dictionary.  It's possible to instantiate a ColorSpace object from this dictionary.  For example:

Page page = //...
Obj group = page.GetSDFObj().FindObj("Group");
if (group && group.IsDict())
{
    Obj cs_obj = group.FindObj("CS");
    if (cs_obj)
    {
        ColorSpace cs(cs_obj);
    }
}