IMAGERESOLUTION

typedef struct _IMAGERESOLUTION
{
   L_UINT uStructSize;
   L_INT nUnitOfResolution;
   L_INT nBitsPerPixel;
   L_FLOAT fHorzResolution;
   L_FLOAT fVertResolution;
   L_FLOAT fXScaling;
   L_FLOAT fYScaling;
   L_FLOAT fRotationAngle;
   L_FLOAT fLeftMargin;
   L_FLOAT fRightMargin;
   L_FLOAT fTopMargin;
   L_FLOAT fBottomMargin;
} IMAGERESOLUTION,  * pIMAGERESOLUTION;

The IMAGERESOLUTION structure provides information about the images effects.

Member	Description
uStructSize	Size of this structure in bytes, for versioning. Use the sizeof() macro to calculate this value.
nUnitOfResolution	An integer having the unit of resolution to use. Possible values are (according to the TWAIN 1.9 specification):
	Value	Meaning
	TWUN_INCHES	Inches unit.
	TWUN_CENTIMETERS	Centimeters unit.
	TWUN_PICAS	Picas unit.
	TWUN_POINTS	Points unit.
	TWUN_TWIPS	Twips unit.
	TWUN_PIXELS	Pixels unit.
nBitsPerPixel	Bits per pixel the acquired images will have.
fHorzResolution	Horizontal resolution of the TWAIN source while acquiring the images.
fVertResolution	Vertical resolution of the TWAIN source while acquiring the images.
fXScaling	The acquired image X-direction scaling value before transferring.
fYScaling	The acquired image X-direction scaling value before transferring.
fRotationAngle	The acquired image rotation angle value before transfer.
fLeftMargin	The left margin of the scanning area.
fRightMargin	The right margin of the scanning area.
fTopMargin	The top margin of the scanning area.
fBottomMargin	The bottom margin of the scanning area.

Comments

Setting the fLeftMargin, fTopMargin, fRightMargin, and fBottomMargin will set the DAT_IMAGELAYOUT structure.

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

IMAGERESOLUTION is used with the LTWAINPROPERTIES structure.