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### 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().

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