1.5 The VDisplay class

The VDisplay class is an abstraction over the VIPS im_col_display type which gives convenient and safe representation of VIPS display profiles.

VIPS display profiles are now obsolete. You’re better off using the ICC colour management VImage member functions ICC_export() and ICC_import().

1.5.1 Constructors

There are two constructors for VDisplay:

VDisplay( const char ⋆name );  
VDisplay();

The first form initialises the display from one of the standard VIPS display types. For example:

VDisplay fred( "sRGB" );  
VDisplay jim( "ultra2-20/2/98" );

Makes fred a profile for making images in sRGB format, and jim a profile representing my workstation display, as of 20/2/98. The second form of constructor makes an uninitialised display.

1.5.2 Projection functions

A set of member functions of VDisplay provide read and write access to the fields in the display.

char ⋆name();  
VDisplayType &type();  
matrix &mat();  
float &YCW();  
float &xCW();  
float &yCW();  
float &YCR();  
float &YCG();  
float &YCB();  
int &Vrwr();  
int &Vrwg();  
int &Vrwb();  
float &Y0R();  
float &Y0G();  
float &Y0B();  
float &gammaR();  
float &gammaG();  
float &gammaB();  
float &B();  
float &P();

Where VDisplayType is defined as:

enum VDisplayType {  
    BARCO,  
    DUMB  
};

And matrix is defined as:

typedef float matrix[3][3];

For a description of all the fields in a VIPS display profile, see the manual page for im_XYZ2RGB().