I'm trying to port a library from Java to .NET that makes heavy use of the java.awt.color namespace. What is the .NET equivalent to this?
I'm not entirely familiar with the Java namespace, but maybe you're looking for System.Drawing.Color?
EDIT: Obviously Java and ICC are not my game, but I figured I'd still try to help out. There are several references to ICC in the documentation for System.Windows.Media.
Color Structure: http://msdn.microsoft.com/en-us/library/system.windows.media.color.aspx
Color Context: http://msdn.microsoft.com/en-us/library/system.windows.media.colorcontext.aspx
Maybe this is a sufficient starting point to find the functionality you are seeking.
The java.awt.color namespace seems to only concern itself with color spaces. There's no such concept in .Net as a color space. Everything in .Net is based on RGB (RGB color space) except perhaps some new XAML attributes in WPF. The java.awt.color namespace includes considerations for such ideas as CMYK (Cyan, Magenta, Yellow b**L**ack) which is used in printing applications only.
My guess is that unless you are indeed working on an application that sends CMYK color data to a printer then you don't need to worry about it. The colors in .Net are based around RGB or aRGB (even the gray scale. The RGB values are simply all equal so RGB(128,128,128=MediumGray)
The SystemColors class provides access to system brushes and colors, such as ControlBrush, ControlBrushKey, and DesktopBrush. A system brush is a SolidColorBrush object that paints an area with the specified system color. A system brush always produces a solid fill; it can't be used to create a gradient.
The System.Drawing namespace has brushes, images, converters, system colours, regions and pretty much all the basics for drawing on windows. I think this works closely with GDI+.
If you have any specif classes you need to map to or requirements add a comment and I'll see what I can do.