IMAGEEFFECTS

typedef struct _IMAGEEFFECTS
{

   L_UINT   uStructSize;
   L_INT nPixFlavor; 
   L_INT nColorScheme; 
   L_FLOAT fHighLight; 
   L_FLOAT fShadow; 
   L_FLOAT fBrightness; 
   L_FLOAT fContrast; 
   L_TCHAR szHalfTone[32]; 
} IMAGEEFFECTS,  * pIMAGEEFFECTS;

The IMAGEEFFECTS structure provides information about the image effects.

Member

Description

uStructSize

Size of the IMAGEEFFECTS structure, in bytes, for versioning. Use the sizeof() macro to calculate the value.

nPixFlavor

Pixel flavor used when acquiring. Possible values are (according to the TWAIN 1.9 specification):

 

Value

Meaning

 

TWPF_CHOCOLATE

Zero stands for the darkest shade.

 

TWPF_VANILLA

Zero stands for the lightest shade.

nColorScheme

Color scheme to use when scanning is to be done. Possible values are (according to the TWAIN 1.9 specification):

 

Value

Meaning

 

TWPT_BW

Black and White (1 bit).

 

TWPT_GRAY

8-bit Gray Scale

 

TWPT_RGB

24-bit RGB Color.

 

TWPT_PALETTE

8-bit Color.

 

TWPT_CMY

CYAN, magenta, yellow color space.

 

TWPT_CMYK

CYAN, magenta, yellow, black color space.

 

TWPT_YUV

Color space type that is true color encoding. It uses one luminance value (Y) and two chroma values (UV).

 

TWPT_YUVK

The same as YUV with an additional black variable.

 

TWPT_CIEXYZ

Chromaticity diagram.

fHighLight

Highlight value.

fShadow

Shadow value.

fBrightness

Brightness value.

fContrast

Contrast value.

szHalfTone

A string having the name of the used pattern.

Comments

pIMAGEEFFECTS is a pointer to a IMAGEEFFECTS structure. Where the function parameter type is pIMAGEEFFECTS, you can declare an IMAGEEFFECTS variable, update the structure's fields, and pass the variable's address in the parameter. Declaring a pIMAGEEFFECTS variable is necessary only if your program requires a pointer.

IMAGEEFFECTS is used with the LTWAINPROPERTIES structure.