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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 this structure in bytes, for versioning. Use the sizeof() macro to calculate this 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. | |
pIMAGEEFFECTS is a pointer to an 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.