Utilizzando colori CMYK in WPF / XAML

Question

C'è un modo per specificare CMYK i colori direttamente in un documento XAML?

anteponendo # carattere creerà colori RGB, ma come per specificare un colore CMYK?

Alcune note:

1. La domanda è: non sulla conversione da CMYK a RGB, ma di utilizzare vera CMYK
2. Lo scopo è quello di permettere generato XPS di documenti (utilizzando System.Windows.Xps.Packaging per esempio) vedere il colore CMYK e generare i codici colore come "ContextColor /swopcmykprofile.icc a, b, c, d, e" non come "#aarrggbb"

ho cercato di definire i colori CMYK utilizzando ColorContext senza alcun successo.

Answer 1

OK again! It turned out to be much more easier than what I though: CMYK is directly usable in XAML:

<Grid Background="ContextColor file://C:/WINDOWS/system32/spool/drivers/color/EuroscaleCoated.icc 1.0,0.0,0.0,1.0,1.0">

Answer 2

OK! I found the answer:

The way that WPF uses colour models is by System.Windows.Media.Color's static constructor FromValues() and introducing a colour profile:

The following code, for example:

var c = Color.FromValues(
               new float[] {1.0f,0.0f,0.0f,0.0f } , 
               new Uri("file://C:/ICCProfile.icc",  UriKind.Absolute));

creates a 100% Cyan colour.

Profiles can be downloaded from http://www.eci.org/doku.php?id=en:start

I tested this solution with XpsDocumentWriter and I confirm that it creates the correct CMYK colour code.

For XAML it is just the matter of building an IValueConverter that converts something like "~C,M,Y,K" (as #RRGGBB for RGB) to a real CMYK colour.