PDFlib 8 Windows COM/.NET Tutorial

setcolor:iccprofilegray, setcolor:iccprofilergb, setcolor:iccprofilecmyk parameters. Subsequently
ICC-based color values can be supplied to setcolor( ) along with one of the color
space keywords iccbasedgray, iccbasedrgb, or iccbasedcmyk:
p.set_parameter("errorpolicy", "return");
icchandle = p.load_iccprofile(...);
if (icchandle == -1)
{
return;
}
p.set_value("setcolor:iccprofilecmyk", icchandle);
p.setcolor("fill", "iccbasedcmyk", 0, 1, 0, 0);
Mapping device colors to ICC-based default color spaces. PDF provides a feature for
mapping device-dependent gray, RGB, or CMYK colors in a page description to deviceindependent
colors. This can be used to attach a precise colorimetric specification to
color values which otherwise would be device-dependent. Mapping color values this
way is accomplished by supplying a DefaultGray, DefaultRGB, or DefaultCMYK color
space definition. In PDFlib it can be achieved by setting the defaultgray, defaultrgb, or
defaultcmyk options of begin_page_ext( ) and supplying an ICC profile handle as the corresponding
value. The following examples will set the sRGB color space as the default
RGB color space for text, images, and vector graphics:
/* sRGB is guaranteed to be always available */
icchandle = p.load_iccprofile("sRGB", "usage=iccbased");
p.begin_page_ext(595, 842, "defaultrgb=" + icchandle);
Defining output intents for PDF/X and PDF/A. An output device (printer) profile can
be used to specify an output condition for PDF/X. This is done by supplying
usage=outputintent in the call to load_iccprofile( ). For PDF/A any kind of profile can be
specified as output intent. For details see Section 10.3, »PDF/X for Print Production«,
page 253, and Section 10.4, »PDF/A for Archiving«, page 260.
86 Chapter 3: Creating PDF Documents (Edition for COM, .NET, and REALbasic)